20. Eating sweets before meals is considered to have the chance to spoil the ______.

　 A. stomach　　　 　　 B. desire　　　　　　　　 C. appetite　　　　　　　　　 　 D. atmosphere

19. The next step in exploring ___________ outer space might be sending people there in ___________ spaceship.

A.不填; a　　　 B. 不填; 不填　　　 C. the; 不填　　　　 D. the; the

18. ---How do you think of his teaching method?

　 ---It should be popular; it ________ practical.

　 A. proves　　　　 B. is proved　　 C. has been proved　　 D. was proved

17. Most of ________ we call geniuses(天才) are successful only because they have made extraordinary efforts.

A. whom　　　 B. who　　　　　　 C. which　　　　　　 D. what

16.After I arrived at her house, she showed me into ____________.

A. a room cosy or little　　　　　　　　 　B. a little cosy room　

C. a cosy little room　　　　　　　　　 D. cosy little a room

15. ______ where to go, he asked a policeman.

　 A. Having lost his way and didn’t know　 B. Losing his way and didn’t know 　 C. Having lost his way and not knowing　 D. Lost his way and didn’t know

14. - Do you want David or Brown to do it?

- _______ is up to the job, I’m afraid.

A. Either　　　　 B. Both　　　　　 C. None　　　　　 D. Neither