42. He ____ see a doctor before it is too late.

　 A must　　　 B must have to　　　 C need　　　 D need have to

41. A computer ____ think for itself, it mist be told what to do.

　 A can’t　　　　 B couldn’t　　　　 C may not　　　　 D might not

40. Excuse me, you ____ enter the teachers’ office without permission.

　 A oughtn’t to　　　 B won’t　　　　 C needn’t　　　　　 D may not

39. Johnny, you ____ play with the knife, you ____ hurt yourself.

　 A won’t; can’t　　 B shouldn’t; must　　　 C can’t; shouldn’t　　　 D mustn’t; may

38. ---I telephoned you several times yesterday, but no one answered.

　 ---Oh, I ____ asleep.

　 A must fall　　　 B must have fallen　　 　C should fall　　 D should have fallen

37. The plant is dead. I ___ it more water.

　 A will give　　　 B would have given　　　 C must give　　　 D should have given

36. ---Let’s go out for a walk, shall we?

　 ---____.

　 A No, I can’t　　　 B should　　　 C No, we’d better not　　　 D Yes, go ahead

35. ----Do you think he is at home now?

　 ----I think he ____ be, for it’s ten o’clock now.

　 A would　　 B should　　　 C might　　　 D ought to

34. I was really anxious about you. You ____ home without a word.

　 A mustn’t leave　　 B shouldn’t have left　　　 C couldn’t have left　　 D needn’t leave

33. You ought ____ for what you have done.

　 A to not be punished 　　B not to be punished　　 C not be punished　　　 D not punish