-There is someone knocking at the door.
- It ______ be Jimmy, he has gone to ShangHai .

 The tall boy ______ be Mike. He has gone to New York to study.

A. mustn’t  B. couldn’t  C. can’t  D. might

--Listen! Tom is singing in the next room.

--It _______ be Tom. He has gone to Shanghai.

A. may??????????? B. must??????????? C. mustn’t???????? D. can’t

—I think the man over there must be Bob.
—It ______ be him. He has gone to Paris.

—Do you know_________?

— He has gone to the museum.