31.--I called you yesterday evening, but there was no answer.

   --Oh, I am sorry I         dinner at my friend's home.

    A. have       B. had        C. was having     D. have had

30. --Will you please show me how to operate the new machine?

    --Sure. It's a piece of cake. Now let me tell you          to do it first.

     A. what      B. how       C. whether        D. which

29. --Which of your two brothers _     _ been abroad?

    --        of them. David has been to Japan, and Robert has been to the USA.

   A. has; All     B. has; Both    C. have; Either    D. have; Neither

28. When we went into the park, we saw someone _     _ Chinese Kongfu.

   A. plays    ,B. played        C. to play    D. playing

27. --Excuse  me.          ?       --You are right. You'd better take a bus.

A. Where is the hospital                  

B. Is there a hospital near here

C. Is the hospital far from here              

D. How can I get to the hospital

26. --Would you mind if I take the seat next to you?

--         .The person who was here has finished his lunch and left

A. Certainly not      B. Enjoy yourself   

C. Better not, please   D. I'm afraid not

25. You should try to do your homework _     _ Mary.

   A. as carefully as      B. so careful as    

C. as careful as       D. so carefully as

24. The story is hard to understand _    _ there are no new words in it.

    A. but         B. so         C. because         D. though

23. Mr. Brown has gone to Tokyo. He will be back _    _ two weeks.

    A. after      B. in             C. for           D. of

22. --Wow! What a nice computer!

   --My parents bought it for my sister and me. It's           

    A. ours      B. hers           C. mine         D. theirs