Look at ______ book on the desk . Is it ______ useful one ?–Yes, it is . In the book there is much advice on how to learn math well.

The light in his office is still on. Do you know _______?—To prepare for the material(材料) the meeting will need tomorrow, I think.

Have you seen the movie The Giant Tangshan Earthquake? — Yes, it’s well worth _______. It’s _______ moving that I’ve seen it twice.

There ___ a class meeting next week. Are you ready?

Hello! Would you like to go the party with me tonight? –I’m sorry I can’t . Mother won’t ______me to go out in the evening .