The given statement is a question. Thus, the answer must be a 'Wh' word. The 'Wh' word must fit in the sentence and must correctly refer to the object 'books'. It must indicate a choice of books, of which the subject likes the best

Option C - what and Option D - such are exclamatory pronouns. 
For example:
What a sunny day! 
Such a beautiful painting!
Options A and B are wrong because which and whose are interrogative pronouns.

Option A - what and Option B - which are the interrogative pronouns that can be used for objects.
For example:
What kind of flower is this?
Which shirt do you want to wear?
Options C and D are wrong because who and whom are used only for people.

Choice D is correct as the pronoun identifies that the dress is elegent. Option A is incorrect as it asks about the elegant dress. Option B questions the reason for the dress being elegant. Option C denotes time. Hence Option D is correct. 

The correct answer is Option D.

The correct answer is Option B.

Interrogative pronouns are used for asking questions. ‘Who’, ‘whom’, ‘whose’ and ‘which’ are interrogative pronouns. We use ‘who’ and ‘whom’ to ask questions about the people. ‘Who’ is used in the place of the subject of the question, like in “Who are they?”. While ‘whom’ is used in the place of the object of the sentence, like in “To whom is Dad talking?”. Since the given sentence doesn’t ask a question about the people, both ‘who’ and ‘whom’ are unsuitable. Thus options A and D are incorrect. On the other hand, we use ‘whose’ to ask to whom something belongs to. Since the given sentence focuses on the person the bag belongs to, ‘whose’ is the apt answer. Therefore option B is correct. ‘Which’ cannot be used in the sentence because it is used to ask someone to name a particular thing, which is not the case here. For example, “Which do you prefer?” Thus option C is incorrect.

The correct answer is Option B.

The correct answer is Option D.

The correct answer is Option B.

The correct answer is Option D.

The correct answer is Option C.

The correct answer is Option C.

The correct answer is Option C.

The correct answer is Option C.

The correct answer is Option B.

The correct answer is Option C.

The correct answer is Option D.
WHAT is used to ask about some thing or activity. In the given sentence, the speaker wants to know about Natalie's nephew's activity.
Hence, WHAT is the appropriate word that can is to be used.
The remaining options are incorrect because:
Option A: HOW is used to determine the manner of something.
Option B: WHY is used to determine the reason of something.
Option C: WHEN is used to determine time period.
Hence, Option D is the correct answer.

The correct answer is Option B.

The correct answer is Option C.

The correct answer is Option A.

The correct answer is Option C.

The correct answer is Option D.

The correct answer is Option D.

The correct answer is Option B.

The correct answer is Option C.

The correct answer is Option B.

The correct answer is Option C.

The correct answer is Option B.

The correct answer is Option D.

The correct answer is Option B.

The correct answer is Option C.

The correct answer is Option A.

The correct answer is Option D.

The correct answer is Option D.

The correct answer is Option A.

The correct answer is Option C.

The correct answer is Option C.

The correct answer is Option E.

The correct answer is Option C.

The correct answer is Option B.

The correct answer is Option B.

The correct answer is Option B.

The correct answer is Option D.

The correct answer is Option E.

In the second sentence it is indicated that the subject went there for the purpose of visiting some friends. Thus, it can be concluded that 'A' is asking the subject his/her purpose for going 'there'. Thus, the answer must be an interrogative word that indicates purpose.

The given sentence is a question. Thus, the answer must be an interrogative word. The answer must refer to the noun 'breakfast'. Thus, the answer must be a pronoun that refers to objects.

In the given question, 'A' asks a question and 'B' gives the answer. As we can see, the answer indicates that Engineers(people) can. Thus, it can be concluded that 'A' asks about the people that can design computers. Thus, the answer must refer to people.

The given sentence is a question. Thus, the answer must be an interrogative pronoun. The sentence is asking about the person to which one has to write about the job. Thus, the pronoun must refer to a person.

The correct answer is Option B.

Since the question is asked for specific information from a general range of possible answers about a favourite subject, "what" should be used. Hence, Option D is correct. The rest of the options do not adhere to this rule, hence incorrect. 

Since the question is asked about a specific person living in the flat and when the person is the subject of the verb, here, "lives", "who" should be used. Hence, Option D is correct. The rest of the options do not adhere to this rule, hence incorrect. 

Since the question is asked for specific information from a restricted range of possible answers:about the choice of a house, "which" should be used. Hence, Option D is correct. The rest of the options do not adhere to this rule, hence incorrect. 

Since the question is about the person who possesses an object, here, the book, "whose" should be used.  Hence, Option D is correct. The rest of the options do not adhere to this rule, hence incorrect. 

Since the question is about the person who possesses an object, here, the cup of tea, "whose" should be used.  Hence, Option D is correct. The rest of the options do not adhere to this rule, hence incorrect. 

Since the question is asked for specific information from a general range of possible answers about an object under the table, "what" should be used. Hence, Option B is correct. The rest of the options do not adhere to this rule, hence incorrect. 

Since the question is asked about a person who is at the receiving end of action, here, writing emails, "whom" should be used. Hence, Option B is correct. The rest of the options do not adhere to this rule, hence incorrect. 

Since the question is asked for specific information from a restricted range of possible answers about a preferred colour, "which" should be used. Hence, Option A is correct. The rest of the options do not adhere to this rule, hence incorrect. 

Since the question is asked for specific information from a general range of possible answers about a logical explanation for being in the backyard, "what" should be used. Hence, Option B is correct. The rest of the options do not adhere to this rule, hence incorrect. 

Since the question is asked for specific information from a general range of possible answers about the contents of the pocket, "what" should be used. Hence, Option D is correct. The rest of the options do not adhere to this rule, hence incorrect. 

Since the question is asked about a person who is at the giving end of the action or is the subject of the verb, here, driving a car, "who" should be used. Hence, Option A is correct. The rest of the options do not adhere to this rule, hence incorrect. 

Since the question is asked for specific information from a general range of possible answers about a possible mode of action, "what" should be used. Hence, Option D is correct. The rest of the options do not adhere to this rule, hence incorrect. 

Option C is correct as 'what' in the sentence determines that the baby is beautiful. Option A is incorrect as it determines time   Option B is incorrect as it determines a person  Option D is incorrect as it determines the reason for the baby being beautiful. Hence Option C is correct.

Since the question is asked for specific information from a general range of possible answers about a reaction to some news, "what" should be used. Hence, Option C is correct. The rest of the options do not adhere to this rule, hence incorrect. 

Interrogative pronouns are used in an interrogating way i.e in while asking questions(who, which, what, whom, whose etc).

Interrogative pronouns are used in an interrogating way i.e in while asking questions (who, which, what, whom, whose etc).

Since the question is asked about a person who is at the receiving end of action, here, consultation regarding health, "whom" should be used. Hence, Option B is correct. The rest of the options do not adhere to this rule, hence incorrect. 

Interrogative pronouns are used in an interrogating way i.e in while asking questions(who, which, what, whom, whose etc).

We use what when we ask about specific information from a general range of possible answers, here, things to be done under the trees. As the objective is to find something, "for" should be used. Hence, Option D is correct. The rest of the options do not adhere to this rule, hence incorrect. 

The correct answer is Option D.

Singular pronouns should take singular verb forms. In the simple present, most regular verbs use the root form, like with first person singular, "I". The root form of smoke is "smoke'". Its negative is "don't smoke". Hence, Option D is correct. The rest of the options do not adhere to this rule, hence incorrect. 

We use the interrogative pronoun "why" to enquire about a purpose, here the purpose for going to the chemists. The infinitive (to+ root verb) is used to express a purpose, here, to buy some medicine. Hence, Option B is correct. The rest of the options do not adhere to this rule, hence incorrect.

We use the interrogative pronoun “where” when we want to find out the location of something or somebody, here, the place where the interrogated person had been. Since the action had happened long in the past, before the action of return, past perfect should be used, hence, "been". Hence, Option B is correct. The rest of the options do not adhere to this rule, hence incorrect. 

Shop assistants are meant to cater to the needs of the customer. Therefore, when the customer tries to attract the assistant's attention, he/she has to ask in what ways he/she can help the customer. Hence, Option C is correct. The rest of the options do not adhere to this rule, hence incorrect.

 The pronouns he/she/it and who and singular nouns take the verb form "has". Japan is a singular noun. Hence, Option C is correct. The rest of the options do not adhere to this rule, hence incorrect. 

In the simple present, most regular verbs use the root form, like with third person plural. The root verb is "see". Therefore cats "see". Hence, Option B is correct. The rest of the options do not adhere to this rule, hence incorrect. 

If we're thanking someone who's actually gone out of their way to do you a favor, versus someone who's just doing their job, it would be common for them to reply with something along the lines of "not at all". Hence, Option D is correct. The rest of the options do not adhere to this rule, hence incorrect.

Communication is the sending and receiving of spoken or written messages between people and places. We can talk to people living far away over the mobile phone, send and receive messages. When we have to communicate with a big group of people, or many people at one time, we have to use means of mass communication. Now we can listen to news, discussions and enjoy the different programmes of entertainment without leaving home. We can also learn about the habits and culture of the people of different parts of the world. Hence, these are means of communication and Option A is correct. The rest of the options do not express these functions, hence, incorrect. 

We use the simple present to express the idea that an action is repeated or usual. The action can be a habit, a hobby, a daily event, a scheduled event or something that often happens, like taking a shower. The pronoun "I" which, although singular, requires plural form of the verb "has" in present tense. Hence, Option C is correct. The rest of the options do not adhere to this rule, hence incorrect.

We use "anyone" to refer to both an open, unlimited set of things or people and specific things or people. We use it with a singular verb.  Here we refer to an unlimited set of people who can explain what happened. Hence, Option C is correct. The rest of the options do not adhere to this rule, hence incorrect.

You use somewhere when giving an approximate, specific location, a hot place. Anywhere is used to refer to any general place. Hence, Option B is correct. The rest of the options do not adhere to this rule, hence incorrect.

We use "anyone" to refer to both an open, unlimited set of things or people and specific things or people. We use it with a singular verb.  Here we refer to an unlimited set of people who might ask about the speaker's absence. Hence, Option A is correct. The rest of the options do not adhere to this rule, hence incorrect.

The present continuous tense(am/is/are+verb+ing) is used to refer to an action that would happen in near future, that is, having. The infinitive or to+root verb is used to express a proposition, that is, "to come". Hence, Option B is correct. The rest of the options do not adhere to this rule, hence incorrect.

The first sentence indicates an invitation to come in the general present, hence, simple present tense should be used.  The basic meaning of the verb have is “to be in the possession of something”. It is used in present simple, and it expresses a fact of having something in the present, here, having a drink. Hence, Option D is correct. The rest of the options do not adhere to this rule, hence incorrect.

"Look forward to "something means to be pleased or excited that it is going to happen, here, having more free time. The "to" in look forward to is a preposition, so we must follow it by a noun phrase or a verb in the -ing form. Hence, Option A is correct. The rest of the options do not adhere to this rule, hence incorrect.

Would is used to talk about a hypothesis or preference, like preference for a drink. Hence, Option C is correct. The rest of the options do not adhere to this rule, hence incorrect. 

Here, 'who' as a pronoun is correct because it is used in questions to ask about the name, identity or function of one or more people. Here, it is being asked about the name of the person responsible for ....
'How' is incorrect as it is used to imply in what way or manner.
'Why' is incorrect because it is used in questions to ask the reason for or purpose of something.
'Whom' is incorrect because it is used instead of ‘who’ as the object of a verb or preposition.

Here, 'what' as an interrogative pronoun is correct because it is used in questions to ask for particular information about somebody/something. Here, information is being asked about Helen's breakfast.
'Where is incorrect because it is used after words or phrases that refer to a place or situation to mean ‘at, in or to which’.
'When' is incorrect because it is used after an expression of time to mean ‘at which’ or ‘on which’.
'Why' is incorrect because it is used in questions to ask the reason for or purpose of something.

We use "what" when we ask about specific information from a general range of possible answers, here, the quality possessed by a baby, that is, cleverness.  Hence, Option C is correct. The rest of the options do not adhere to this rule, hence incorrect.