TOEFL EXERCISE_2

7.  It is not clear when­____, Although there are many different theories.
a. dinosaurs becoming extinct

b. dinosaurs extinction
c. dinosaurs became extinct
d. did dinosaurs become extinct
Explanation : The answer is C because it is past tense and it happened in the past.

8. The professor decide to allow to students to take the examination a second time because the low scores.
Explanation : The answer is D because it must use because of. Because of is a preposition, it is generally followed by a verb+ing or a noun.

9. If the driver's own car _____ damage, the favorite probably would have won the race.
a. had not been
b. not
c. no had been
d. has no been
Explanation : Conditional sentences. The past perfect is used in conditional sentences to express a hypothetical, counterfactual circumstance. In these constructions the condition clause (directly after "if") is in a past time frame, and the main clause (the consequence) is in a past, present, or future time frame. 

10. Having withdrawn from the race, the candidate decided supporting his opponent despite the opponent's representing the other political party.
 Explanation : The answer is B. Decided must be followed by the infinitive (to support)

11. The soldiers were unable to determine where ____.
a. the jeep had been left
b. had been leave the jeep
c. had the jeep been left
d. had the jeep left
Explanation : After the question word in an embedded question, the order is subject + verb.

12. The manager was angry because somebody _____.
a. had allowed the photographers to enter the building

b. had let the photographers to enter into the building

c. permitting the photographers enter the building

d. the photographer let into the building without the proper documentations

Explanation : The past perfect tense is used to describe an action that happened before another action and both of these actions have happened in the past. The first thing that happens first is the past perfect tense. The action that occurs after the use of the past simple tense. 

Recipe: S + had + past participle

allow sb to do sth: allow anyone to do anything

13. The committee members resented ____ of the meeting.

a. the president that he did not tell them

b. the president not to inform them

c. the president’s not informing them

d. that the president had failed informing themselve

Explanation : the answer is c, Resent is a transitive verb, followed by a verb noun. In this sentence, there is an additional logical subject before the gerund, so you must add 's after the logical subject to form the correct grammatical form

14. _____ did Arthur realize that there was danger.

a. upon entering the store

b. when he entered the store

c. after he had entered the store

d. only after entering the store

Explanation :  after a limiting word (only) introduces a sentence, so this sentence has the auxiliary did