. — ____ I know your name ?    — Sorry , you ____ .

A . May ; mayn''t    B . May ; can''t   C . Must ; mustn''t   D . Need ; must

His failure suggested that he   the teacher’s suggestions．

A．can’t have followed                    B．needn’t follow

C．mustn’t have followed                  D．shouldn’t follow

 I’ve taken someone else’s green sweater by mistakes. It ______ Harry’s. He always wears green..

You    scold such a pupil who always keeps silent so seriously that you      hurt him.

Oh, I’m not feeling well in the stomach. I ______ so much fried chicken just now.

A．shouldn’t eat                         B．mustn’t have eaten

C．mustn’t eat                           D．shouldn’t have eaten