—Will you stay for some more days?

—Sorry, I_____. My mother called to ask me to go back at once.

A. mustn’t          B. may not          C. can’t               D. wouldn’t

The students ought to wear school uniforms when they’re at schoo1．

  A．a(chǎn)re supposed to  B are allowed to    C would like to    D．1ove to

—Mr Smith must have been to your home this morning．

—No, he ______, because he didn’t know my address．

A．couldn’t    B．can   C. mustn’t  D. may not

一How was the youth club last night，Mark?

一It was great fun．You _____ come．

A．must　　　 B．can　　　 C．should　　　 D．may

—Is this John’s T-shirt?

—It _____ be his. It`s much too small for him.

　　 A. needn’t　 B. shouldn’t　 C. can’t D. must

The desk is not dirty. You    clean it.

  A. mustn’t    B. shouldn’t    C. needn’t D. can’t

--Can I go to the movie，Mum？

--Certainly． But you 　be back by ten o’clock．

　 A． can　　　　　　 B． may　　　　　　　 C． might　　 　　　D． must

Trees ____ fight air pollution．They are natural air conditioners．

       A．should    B．must    C．need   D．can

It doesn't look like rain, so you_______ bring your umbrella with you.

A. shouldn't         B. mustn't          C. can't          D. needn't

—Must I leave the room now?

—No，you　　 .

A. needn’t 　　　　　 B. can’t 　　 C. mustn’t 　　　 D. couldn’t