35. –How long ______ the book be kept?

　　　　 --For two weeks, but you ______ return it on time.

　　　　 A. can; may　　　 B. may; need　　　 C. can; must　　　 D. must; need

34. Look out! The knife is very sharp. You ______ cut your finger.

　　　　 A. need　　　　　 B. must　　　　　 C. should　　　　 D. may

33. –Do you think his story ______ true?　 --I don’ think so. But it sounds good.

A. must be　　　　 B. may be　　　　 C. can be　　　　 D. has to be

32. Cars and buses ______ stop when the traffic lights turn red.

　　　　 A. can　　　　　　 B. need　　　　　 C. may　　　　　 D. must

31. Teachers and students ______ look coldly at you for a day or two, but there are friendly feelings in their hearts.

　　　　 A. must　　　　　 B. can　　　　　　 C. may　　　　　 D. should

30. The matter ______ be changed into a gas, but it _______ be heated to its boiling point.

　　　　 A. may; needn’t　　 B. may; can　　　 C. mustn’t; needn’t D. can; must

29. A teacher ______ do every exercise, but a student must.

　　　　 A. may not　　　　 B. needn’t　　　　 C. can’t　　　　　 D. mustn’t

28. ______ you be happy!

　　　　 A. Might　　　　　 B. Must　　　　　 C. Wish　　　　　 D. May

27. I ______ like to know where you were born.

　　　　 A. shall　　　　　 B. should　　　　　 C. do　　　　　　 D. may

26. What kinds of homes will we live in the future? Nobody ______ be sure, but scientists are working out new ideas now.

　　　　 A. will　　　　　　 B. may　　　　　　 C. can　　　　　 D. must