Correct answer:2; because it uses a past tense form to talk about the present or future. In fact, past tenses are used to talk about the present / future in many phrases with time.

Correct answer:4   'For the past ten years' indicates a period of time, therefore present perfect continuous tense is used. Present perfect continuous tense is used when we know the starting point of the action, but not its end.

Correct answer:3 : ‘Practising it’ is used as the object of the sentence. Try what? Try ‘practising it’. Hence ‘3’ is the right answer.    

Correct answer:3  ' Yesterday' indicates a time phrase of the  past action. Hence,it is the case of simple past tense.   

Correct answer: 3 The expression 'had I' is followed by Past participle. The construction of ' had I' takes a Past participle with it .

Correct answer:1 : To maintain parallelism in the sentence we use present tense. It could also be “ the higher we went, the cooler it became”

Correct answer :- 4  'if' is used as a conditional sentence. 'Were' is used with 'if ' in situations that are hypothetical or only in imagination.

Correct answer:- (3) All the verbs of the sentence are in Simple Present Tense. (says, knows, don't,..)To maintain parallelism the word 'does' is used. The word 'does' is also used to avoid repetition  of the action, in this case, 'knows Hindi' 

Correct answer :- 2  The word 'ought to' means 'should' , but it is stronger than should.  'Have been done' is the right option.

Correct answer :- 3  The 'swearing in ' is done by some one else. Hence, a passive structure is used requiring a ' was sworn' in the sentence.

Correct answer :- 3  ' If' is conditional. In this sentence ' if ' will take 'arrives' with it. The correct sentence can also be ,' If the minister arrives late the Cultural Program ' will be cancelled.

Correct answer:- 1 All universal facts are written in Simple Present Tense.

Correct Answer:2 : As the other verb(spoke) is in past tense 'could' indicates the past of his ability as his speaking is over, hence, 'he spoke as loudly as he could” . for example, 'I performed as well as I could in the test'.

Correct Answer:4  'Usually' indicates a habitual action, therefore Simple Present Tense is usually. The time phrase ‘everyday’ indicates a regular action. I is followed by have.

Correct Answer:1  The match will have to be cancelled by someone, it cannot cancel on its own, and therefore option (1) is the right answer. 'If' followed by a Simple Present Tense  can take any tense in the next clause . here ' will be cancelled ' is the right option.

Correct answer :(4) As the sentence has all other verbs in Present Tenses, so to maintain the parallelism 'don't care' is the right answer.

Correct answer :- 2  As the subject 'The growing number' is singular, it agrees with a singular verb.

 The only right expression when examination is considered. You 'take' an examination, you don't 'give' an examination. 'Appeared' takes a 'for' with it; 'appeared for' a test.  

Correct answer : - 1 The sentence is in Simple Past Tense (hint: last year).

Correct answer :- 3  The  First 'if' condition applies here If + Simple Present Tense+ any Tense

Correct answer :- 2 'Twenty kilometers' is treated as one distance.

Correct answer :- 4 The word 'recently' is also used in Simple Present but  Present Perfect is a better choice.

Correct answer:- 4 'Must' used in this sentence indicates strong determination. No other option fits here. Hence (4) is the right answer.

Correct Answer:3  'Listen' indicates an action that is presently going on.

Correct answer :-2 To maintain  parallelism , the first part of the sentense has 'before' as a time phrase of the past, therefore the second part of the sentence will have ' had' in it.