A. in B. at C. to D. from

16. You can ask me ________question at ________time.

A. some, some B. some, any C. any, some D. any, any

17. Great changes happened in China _________.

A. in the 1980s B. in the 1980 C. in 1980s D. on the 1980

18. They arrived ________Beijing _________the morning of May 10.

A. at, in B. at, on C. in, in D. in, on

19. _________July 12,2009, he went to Shanghai for the first time _________a plane.

A. On, on B. On, by C. In, on D. In, by

20. Don't worry. I'll try my best ________you.

A. help B. helping C. helps D. to help

21.You can keep the book for another week, but you lend it to others.

　A. needn't B. mustn't C. aren't D. must

22.He can go with you, but I ____________.

A. am not B. can't C. don't D. must

23.What are you doing ____________ Monday morning?

A. on B at C. in D. /

24.Thanks for ____________ me to the party.

A. ask B. to ask C. asks D. asking

25.Bob can't come out to play because he ____________help Dad in the garden.

A. can B. can't C. has to D. must

26.-Would you like to go boating with me?

　-Sure, .

A. I'd like B. I'd love C. I'll be glad D. I'd love to

27. - Can you help me with my math?