Answer of toefl part 1

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
I choose C, because this sentence need subject and verb

8. The professor decided to allow the student to take the examination a second time because the low scores.
I choose because ,Because is not right and we should put "because of"

9. If the driver’s own car __________ damaged, the favorite probably would have won the race.
A. had not been
B. not
C. no had been
D. has no be
I choose A, because it's form of conditional sentence type 3.

10. Having withdraw from the race, the candidate decided supporting his opponent despite the opponent's representing the other political party.
I choose despite , because despite is not right answer and should put the conjuction "because" to right answer.

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
I choose A, because it is form of past perfect continous

12. The manager was angry because somebody _________.
A. had allowed the photographers to enter the building
B. had let the photographers to enter the building
C. permitting the photographers enter the building
D. the photographers let into the building
I choose A, because It is form of past perfect

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 themselves
I choose C, because it is sentence 2 and there is Subject and Verb to complete the sentence 1.

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
I choose A, because there is S + V to get the right sentence