1 . -It ________Jack who is at the gate of the library.
-It ________him. I saw him off at the railway station just an hour ago.

A．can be; can't be	B．must be; can't be
C．can be; must have been	D．must be; can't have been

2 . Some aspects of a pilot’s job ___ be boring and pilots often ___ work at inconvenient times．

A．can，have to	B．may，can
C．have to，may	D．ought to，must

3 . Judging from his accent, he_______ be from Australia.

A．needn't

B．mustn't

C．can't

D．wouldn't

4 . She is a quiet girl at school，but sometimes she _____ be very naughty.

A．should

B．would

C．can

D．will

5 . We hope that as many people as possible        join us for the picnic tomorrow.

A．need

B．can

C．must

D．should

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

A．shall

B．may

C．must

D．can

7 . There is no light on--- they _______ be at home.

A．mustn’t

B．can’t

C．needn’t

D．shouldn’t