–Whose shirt is this?--It _______ be Li Lei’s. It is too big for him.

The Spring Festival   in January or February.

 The man in the office ____be Mr. Black because he phoned me from London just now.

—Listen! Is Mary singing in the next room?—No. It _______ be Mary．She has gone to Shanghai for an important meeting.

—People find it hard to get across the river．—I think at least two bridges         over it．