（ ）1.（2016年邵阳）—Must I clean the room now, Mom?
—No, .
A. you mustn't B. you needn't C. you can't
（ ）2.---What would you send to your sister as the Christmas gift?
---I haven’t decided yet. I ______ send her a hand bag.
A. shall B. may C. must
（ ）3.（2016年自贡） ---Whose book is this ?
----I am not sure. It _____ be Mary’s.
A. shall B. must C. might
