—Hurry up , or you ________ catch the train.

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

Thomas, please be quiet. The others _____ hear very well.

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

- Shall I tell Shirley the good news?

 -No, you________. I've told her already.

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