1 . I heard they went skiing in the mountains last winter. It          be true because there was little snow there.

A．can’t

B．may not

C．won’t

D．mustn’t

2 . Jane __________ be in the office. She has gone to the meeting room.

A．mustn’t

B．needn’t

C．can’t

D．shouldn’t

3 . –Is there an express to Beijing tonight?
-- There ______be , but you’d better call the booking office to make sure.’

A．can

B．might

C．will

D．must