may,can,must,need,shall辨析

1.-There'ssomebodyatthedoor.Who___itbe?Isitthepostman?-No,it___behim.It'sjustseveno'c... 1.-There's somebody at the door.Who ___it be?Is it the postman ?
-No,it ___be him.It's just seven o'clock.It's too early
A. may;can't B.will;won't C.may mustn't D.must;may not
2.-Shall I tell John about it ?
-No ,you __.I've told him already .
A mustn't B needn't C can't D shan't
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2012-07-30
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A B 
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