请教几道英语题，有关情态动词的：

1.Mr Black ,many customers want to see you._____they wait here or outside? C.can
A.will B.shall C.can Dwould
2.The woman you saw in the supermarker____be Mary. She is in hospital now. A.can't
A.can't B.needn't C.shouldn't D.mustn't
3.You_____ be sleepy already -you went to bed early last night. B.can't
A.mustn't B.can't C.wouldn't D.needn't
4.Could I use yout computer to type a letter ?
You____have my computer if you don't take good care of it. D.should not
A.shall not B.might not C.need not D.should not
5.Tom,you___leave your clothes on the floor like this! B.mustn't
A.wouldn't B.mustn't C.needn't D.may not

BABAB
shall有表请求询问的意思（no。1），can‘t 解释为不可能（no。2,3），shall有威胁的意味（no。4）是经典题，mustn’t是表示禁绝

1.Mr Black ,many customers want to see you.__B___they wait here or outside?
A.will B.shall C.can Dwould
2.The woman you saw in the supermarker__A__be Mary. She is in hospital naw.
A.can't B.needn't C.shouldn't D.mustn't
3.You__ B___ be sleepy already -you went to bed early last night.
A.mustn't B.can't C.wouldn't D.needn't
4.Could I yse yout computer to type a letter ?
You__D__have my computer if you don't take good care of it.
A.shall not B.might not C.need not D.should not
5.Tom,you_B__leave your clothes on the floor like this!
A.wouldn't B.mustn't C.needn't D.may not

1 B shall表示寻求建议
2 A 不可能
3 B 不可能
4 B 不允许
5 B 不许