—There is somebody at the door. Who ___________ it be? Is it the postman?—No. It can’t be him. It’s just seven o’clock. It’s too early.
This is your classroom. __________ is next door.
---- Is that man Mr. Zhang? ---- It ______ be him. He has gone to Beijing for the meeting.
My family are going on a trip to Qingdao as soon as we _________ the holiday.
Lisa, can you tell me _______ just now?
They seldom think about the people, __________?