有关情态动词的：1.Mr Black ,many customers want to see you._____they

有关情态动词的：
1.Mr Black ,many customers want to see you._____they wait here or outside?
A.will B.shall C.can Dwould
2.The woman you saw in the supermarker____be Mary.She is in hospital naw.
A.can't B.needn't C.shouldn't D.mustn't
3.You_____ 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____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___leave your clothes on the floor like this!
A.wouldn't B.mustn't C.needn't D.may not
就情态动词这一块我老是弄不懂,谢谢你们了.