---There’s someone knocking on the door. Who _________ it be?---It must be John. He promised to be here at 8:00.

—Where is Zhang Hua? Is he in the classroom now?—He          be there, for I saw him in the teachers’ office just now.

  --- What will the weather be like tomorrow? --- It ______ be rainy, cloudy or sunny. Who knows?

----Shall I go and buy more food and drinks for the party ?----- No, we have prepared a fridge of those.That ____ be quite enough.

—Why don’t you wear your jogging shorts, mum?—Well, my legs are too skinny, if you ______ know.