Answer
7. C : dinosaurs became extinct. Because it is past tense and it happened in the past.
8. D : because. The expression must be because of because it is followed by a noun phrase, the low scores.
9. A : had not been. Use the past perfect construction in past condition.
10. B : supporting. Decide must be followed by the infinitive, to support.
11. A : the jeep had been left. After the question word in an embedded question, the order is subject + verb.
12. A : had allowed the photographers to enter the building. 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.
13. C : the president’s not informing them. After the verb resented there must be a noun phrase or a clause. Remember that after a verb that requires a gerund in the subordinate clause, any noun must be possessive. Informing is a gerund because of resented.
14. D : only after entering the store. After a limiting a word (only) introduces a sentence, the order of the subject and verb is altered. That is why this sentence has the auxiliary did. A would have been correct if the order hadn’t been reversed: upon entering the store, Arthur realized.
