You ______ be hungry already ― you had lunch only two hours ago!

A. wouldn’t       B. can’t       C. mustn’t         D. needn’t

There is no light in the dormitory.They must have gone to the lecture, _____??

A.didn’t they ?

B.don’t they?

C.mustn’t they　?

D.haven’t they?

. - The speaker is a tall man with glasses.

     - Then it_____ be Mr. Smith, who is short and thin.

A. wouldn't            B. won't             C. mustn't            D. can't

You ______ be hungry already ― you had lunch only two hours ago!

A. wouldn’t       B. can’t       C. mustn’t         D. needn’t

— I’ve taken someone else’s green sweater by mistake.

— It ______ Harry’s. He always wears green.

A. has to be        B. will be          C. mustn’t be          D. could be