--Listen! Someone is knocking at the door. Who _____it be?---It_____be Tom. He phoned to visit me this evening.
–Do you like staying at home ________? --No, I don’t. That always makes me feel lonely(孤独的).
My father stayed in the library ___________.
__________ he studied hard, he still failed the test.
Mr. Zhang will give us a report as soon as he _________.
—Let’s play tennis. —_________.