There’s somebody at the door. Who ____ it be? Is it the postman? — No. It ______ be him. It’s just seven o’clock. It’s too early.

I don’t know what _____ if I do that. —I think you ______ tell him the whole thing first.

He worked ______ hard ______ he could pass the exam. [ ]

The geography teacher told us the earth________ bigger than the moon.

I didn’t see you when I went to your office yesterday afternoon. Where were you?—I ____ a meeting in the meeting room.