Fill in the Blanks

“To go through” is an idiom which means “to read” which is conveyed in the given sentence. Hence, (1) is the correct answer.

”To be fast at” is an idiom which means “to be quick at “which is conveyed in the given sentence. Moreover, we are 'good in' subjects, but 'fast at' practices (like calculations). Hence, (3) is the correct answer.

”To blow out” is an idiom which means “to extinguish” which is conveyed the given sentence. Hence, (4) is the correct answer.

The given sentence is of coordinate clause which must have both the clauses in the same tense. The tense is past perfect continuous. Hence, (4) is the correct answer.

“To cordon off” means “to surround” which is conveyed by the given sentence. Hence, (2) is the correct answer.

“To see through” is an idiom which means “to understand or to be able to understand” which is conveyed by the given sentence. Hence, (2) is the correct

It is clear in the sentence that when the uncle entered the room, the letter writing activity was also under the process. To show this parallel continuity of two actions of the past, we use past continuous tense. Hence, (1) is the correct answer.

The given sentence refers to the present perfect continuous tense showing the point of time. Hence, (4) is the correct answer.

The given sentence belongs to the Adverb clause of time and it being a complex sentence must have the same tense. Hence, (4) is the correct answer.

“To put in order” is an idiom which means “to set in order” which is conveyed by the given sentence. Hence, (3) is the correct answer.

Providing break through” is an idiom which means “to provide a forcible passage through a barrier” which is conveyed in the given sentence. Hence, (4) is the correct answer.

It is an adverb of comparative degree which shows a comparison between the uses of penicillin and sulphanilamide. Hence, (2) is the correct answer.

 Rare is the correct answer because the sentence is suggesting that changes in behavior is not uncommon, therefore if they are common, they are not rare.

Only option 2 makes sense here as it means that art incorporates science but scientific theories may or may not be understood by an artist.

As the articles were not published, they were omitted and the reason or excuse for this omission is given.