TOEFL EXERCISE_2
7. It is not clear when____, Although there are many different theories. a. dinosaurs becoming extinct b. dinosaurs extinction c. d inosaurs became extinct d. did dinosaurs become extinct Explanation : The answer is C because i t 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 conseque...