( )12. May I hand in the exercise-book now? Yes, you__________.

　　A. may B. can’t C. may not

　　( )13. You ______________ talk so loud in the library.

　　A. mustn’t B. can C. not

　　( )14. ____________ I come here tonight? No, you may not.

　　A. Must B. May C. Can

　　( )15. You must be here at six tomorrow morning.

　　Sorry. I_______be here so early.

　　A. must B. can’t C. may

　　( )16.Don’t be late. You_______ be there on time.

　　A. must B. can C. may

　　( )17._________I use your pen? Sure, here you are.

　　A. Must B. May C. Can’t

　　( )18.What______for you? said my sister.

　　A. I can do B. can I do C.I may do

　　( )19 .The light is poor. I______ see the words on the blackboard.

　　A. can

　　B. can’t C. mustn’t

　　( )20.It’s a rainy day today. You______ take an umbrella with you.

　　A. can B. can ‘t C. had better

　　二.把下列句子改为否定句、一般疑问句并做肯定、否定回答。

　　1.He can speak English

　　2.We must go to the park on foot.

　　3.They can play football.

　　4.We may go home now.

　　5.I can write a postcard.

　　6.She can dance.

　　7.I must play the piano.

　　8.We must go shopping.

　　9.We may sleep now.

　　10.I can swim fast.