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

 Martin hasn't got in touch with me for ages. He ________ my new cell phone number.

Tom likes driving and he ______drive his car to the party, but I’m not quite sure about it yet.

—Could I borrow your dictionary?—Yes，of course you ________.

You have already tried your best, so you _____worry too much about the exams.