26. It’s time for bed now. Before you sleep, remember to turn off the recorder. Press （按） the ______ key.

25. －Excuse me, can you tell me the answer to this question?

－Sorry, I can not do it now. I have to ______ about it.

   A. talk            B. think               C. write                    D. worry

24. In the bookshop, a reader asked the shopkeeper ______ Who Moved My Cheese was an interesting book.

   A. that            B. how                C. what                     D. if

23. －_____ have you been a green volunteer?

   －For more than three years.

   A. How often       B. How long            C. How soon                D. How much

22. －Have you returned the book?

   －Not yet. Don’t worry. I ______ it when I finish it.

   A. return         B. returned                     C. will return                 D. have returned

21. We have to ______ our sports meeting till next week because of the heavy rain.

   A. put off                B. put on               C. put up                    D. put down

20. －He was ______ tired ______ he fell asleep as soon as he lay down.

   －Oh, we can go out and let him have a good rest.

   A. too; to          B. so; that               C. enough; to                       D. such; that

19. －Is that Maria speaking?

   －Sorry, he isn’t in. He ______ abroad on business.

   A. goes            B. went                 C. will go                  D. has gone

18. －I like the party so much, but I ______ go home. It’s so late.

   －What a pity!

   A. mustn’t         B. have to              C. can’t                    D. may

17. －You did well in the exam. You’ve made ______ mistakes.

   －Thank you.

   A. little          B. a little               C. few                     D. a few