Are Mr. and Mrs. White living alone in the house— Yes. They have three sons, but ______ of them live with their parents.

I like sports very much and I don’t want to stay at home and do nothing.—OK! Let’s _ _.

We’d better have a ___________ discussion if we go to a ___________ place for the class trip.

Do you know something about Christopher Columbus— He’s an Italian Navigator (航海家) who __________ America in 1492.

I hear Johnson was badly injured in the accident. — ____, let’s go and see him.