'capable' in place of 'able'. Incorrect word usage has been done. ”Capable” means having the ability whereas “able” means talented. A mural cannot be intelligent.

‘wonder’ in place of ‘wonders’. On account of the plural word “many” we will not use the plural form of the verb.

‘they are’ in place of ‘they will be’. Since present tense is used so avoid using the verb in the future tense. The second option cannot be changed to future tense because we avoid using double future in a sentence.

‘in the face of’. The correct phrase is “in the face of” article “the” was missing.

‘illusions’ in place of ‘allusions’. Incorrect word usage has been done. ”illusion” means a false idea or conception; belief or opinion not in accord with the facts whereas “allusion” means a suggestion. First sense is being conveyed in the sentence so “illusion” should be used.

‘farther’ in place of ‘further’. Incorrect word usage has been done. The word “farther” means more distant or remote The comparative form of “far” is “farther”.

‘ones’ in place of ‘his’. When the pronoun “one” is used in the previous part of the clause then it’s possessive pronoun “one’s” should be used and not “his/her”.

‘with’ in place of ‘by’. ”By” is used for a person whereas "with" conveys the sense of the help of something. Here the second sense is being conveyed.

With’ in place of ‘out of’. The correct preposition is “with” meaning by anger.

‘as’ in place of ‘that’. Relative pronoun “as” should be used in place of that when “such” comes in the previous clause.

(1) Fluosol is a transparent liquid. An adjective form of the word should be used to modify the noun and not noun form. ”Transparent” is the right adjective which modifies the noun “liquid”.

(3) that it will arrive in an hour. Incorrect article is used. With the word beginning with the vowel sound we use article “an”. The word “hour” starts with the vowel sound “a” so “an” should be used.

(2) is expected to be faster. The subject “next generation” is singular so singular verb “is” should be used.

(3) in water as well as on land. Use“in” for water and 'on' for land.

(4) in its unique splendor. Subject & pronoun agreement error is made. The subject “Himalayas” is used in the singular form so singular pronoun should be used.

(3) has indicated their unwillingness. Sentences starting with Indefinite Pronoun  “Each” are used in the singular form ,so singular pronoun his/her should be used. Therefore "...his or her unwillingess..."

(1) Arthur leads a contented life. The right form of the word to be used is “contented”.

(1) The ground felt very smooth. Instead of “smoothly” we will use “smooth” as the sense conveyed by the first word is that the ground was feeling something rather it should be the ground was felt by others to be smooth.

(2) remains the most important single theorem. Superlative form should be used as the comparison is made out of all the theorems. Adjective “very” should be replaced by “most”. 

Soldiers dragged him. Since the principal clause is in the past tense so the subordinate clause should also be in the past tense.

Put it off. The correct expression is “put it off”. Preposition “off” should be used meaning to delay.

(1) Creatures on Mars, if any. Unnecessary use of the definite article “the” is making the sentence ambiguous. “the” is not required as we are not talking about any specific type of creature. Furthermore, when stating "the creatures" implies that they do exist. This negates the phrase "if any". Hence, this is correct.

Replace “neither” with “nor”. Incorrect negative word is used. “Nor” is used after some negatives such as; as not, no, never.

they are. The verbal word “are” should be added to complete the sentence. “Are” stands for the troubles. 

”that” in place of “because”. Incorrect conjunction is being used. “That “should be used as a statement is made.