1 . Most of the big hotels in Shanghai were full last week, but finally we______find a room in a small one.

A．ought to

B．could

C．were able to

D．might

2 . -----Who ______ it be that hasn’t handed it in yesterday?
------It _______ be Bob. He handed it in yesterday.

A．can; mustn’t

B．must; can

C．can; can’t

D．may; mustn’t

3 . Helen________ go on the trip with us, but she isn’t quite sure yet.

A．shall

B．may

C．must

D．can