---Who is the tallest boy? ---It ______ be John.. John is of medium height.
—I think students should have mobile phones to call their parents.—_____. They often use them to play games instead.
—Excuse me. Can you please tell me _________?—Sure. There’s a bookstore on River Road.
Mrs. Smith often goes to visit those AIDS patients in hospitals to_________.
We all know how wonderful you are. You needn’t _________.
There _________a girl singing next door. Can’t you hear her beautiful voice?