21. Nobody _____ do it. Let me _____ .

　 A. can, try　　 B. can’t, to try　　 C. can, to try　　 D. can’t, trying

20. -Shall we go to the zoo tomorrow?

　　 -　　 .

　 A. Yes, we shall　　　　 B. Yes, you shall

　 C. Yes, you will　　　　 D. All right

19. -Is Xiao Li in the classroom?

　 -No, he　　 there. I saw him in the reading room just now.

　 A. can’t be　　 B. mustn’t be　　 C. is　　 D. needn’t

18. The PRC　　 in 1949.

　 A. was found　　 B. found　　 C. was founded　　 D. founded

17. Oh, sorry. I　　 you　　 in Shanghai.

　 A. don’t know…are　　　 B. didn’t know…were

　 C. don’t know…were　　 D. haven’t known…are

16. -_____I watch TV after dinner, Mum?

　　 -No, you　　 .

　 A. May; mustn’t　　　 B. May; don’t

　 C. May; won’t　　　　 D. Must; mustn’t

15. You　　 go with us at once.

　 A. need　　　 B. should　　　　 C. would　　　　 D. could

14. It was a cold night. An old man　　 under a chair in the park.

　 A. is lying 　　B. was lying　　 C. has lying　　 D. will lie

13. You　　 answer this question.

　 A. haven’t to　　 B. don’t have to　　 C. don’t need　　 D. needn’t to

12. Li Li　　 get up at 7:30.

　 A. used to　　　 B. used　　　 C. was used to　　　 D. uses to