31.If you ______me, I shall be very grateful to you .
　　A)helped
　　B)will help
　　C)are helping
　　D)will be helping
　　32.It _____rain tomorrow.
　　A)can
　　B)must
　　C)should
　　D)may
　　33."Did they blame him for his mistakes?" "Yes,but they _____so."
　　A)would rather not do
　　B)shouldn't do
　　C)shouldn't have done
　　D)had better not do
　　34."Did your brother break the window?" "He _____have done it.I am not sure."
　　A)must
　　B)might
　　C)can't
　　D)would not
　　35.Since it is already midnight,we______.
　　A)had better left
　　B)ought to have left
　　C)should take leave
　　D)might as well leave
　　36.She doesn't answer the doorbell.She _____be asleep.
　　A)ought to
　　B)might
　　C)can
　　D)must have been
　　37._____you be happy!
　　A)May
　　B)Can
　　C)Must
　　D)Would
　　38.You_____afraid of any difficulties.
　　A)need not to be
　　B)need not
　　C)don't need
　　D)need not be
　　39.The house is dark;the Turners_____to bed.
　　A)may go
　　B)can have gone
　　C)must have gone
　　D)must go
　　40.______open the door for you?
　　A)Would I
　　B)May I
　　C)Will I
　　D)Shall I
　　答案：31. B 32. D 33. C 34. B 35. D 36. B 37. A 38. D 39. C 40. D

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