13. The line is busy; someone ___ the telephone now.
            A. must be using       B. must have used    C. must useD. must have been using
14. She told me that she’d rather ___ on the committee.           
            A. not to serve          B. not serving           C. not serve   D. serving not
15. “Are you still going to Florida for vacation?” “Yes, but I really ___because I don’t have much money.”
            A. shouldn’t   B. can’t           C. mustn’t      D. won’t
16. “Did Peter go downtown by car or by train?” “He ___by train because his car was in the mechanics.”
            A. must go     B. has to go    C. had gone   D. must have gone
17. “Why are you so mad?” “You ___ me you weren’t coming to dinner. I waited for you for two hours.”
            A. should tell B. should have told  C. should told           D. should had told
18. “Do you like to play tennis?” “I ___, but now I prefer golf”
            A. used to      B. used to do C. used to played      D. used to playing
19. “Have you seen Kate?” “No, but she ___ be at her desk.”
            A. may           B. ought         C. would        D. can
20. “Can I borrow twenty dollars?” “No, you know I ___ lend you money any more.”
            A. might not  B. shouldn’t have     C. won’t         D. not going to
21. The plane ___ take off after the fog had lifted.
            A. must          B. can C. was able to           D. may
22. ___ you remember what you were doing at this time yesterday?
            A. Can            B. Must          C. May           D. Should
23. I ___ understand this letter. Will you translate it for me?
            A. mustn’t      B. may not     C. can’t           D. shouldn’t
24. Daisy’s parents don’t let her go to late- night disco. She ___ be at home at 9 o’clock in the evening.
            A. must          B. may            C. can D. has to                   
25. ___ you give me some advice about the language course?
            A. Have          B. Should       C. May           D. Could
26. Why didn’t you give me a call yesterday? We ___ discuss everything together.
            A. can B. may            C. must           D. could
27. Yesterday I ___ finish the work because I was very tired.