20. But for the help of my teacher, I 　　　the first prize in the Competition.

　　 A. would not have won　 B. had not won　 C. would have won　　　 D. have won

19. So sudden 　　　　　that the enemy 　　　　　no time to escape.

　　 A. did the attack; had 　　　　　　　　　　　　　　　　　 B. was the attack; had had

　　 C. was the attack; had 　　　　　　　　　　　　　　　　　 D. did the attack; had had

18.　　 twice, the postman refused to deliver our letters unless we chained our dog.

　　 A. Being bitten　　　　　　 B. Bitten　　　　　　　　　　 C. Having bitten　　　　　 D. To be bitten

17. The news came as quite a shock to us, but he seemed to be_________ surprised.

A. simply　　　　 　 　B. entirely　　　 　　C. absolutely　　 　　D. hardly

16. ______ difficult the task may be, we must finish it on time, because we can’t miss ______ a precious opportunity．

　　　　 A. Whatever; so　　　 B. However; such 　　　 C. However; so 　　　　　 D. Whatever, such

15. The discovery of gold in California 　　　　a rush to get there.

　　 A. set off　　　　　　　　　　 B. set up　　　　　　　　　　　 C. set out　　　　　　　　　 D. set in

14. The Olympic snowboarding event, 　　　　, was exciting．

　 　 A. on which many people watched　　　　　　　　　　 B. where many people watched TV

　 　 C. which many people watched on TV　　　　　　　　 D. where many people watched on TV