I'm amazed that Tom is only 25. I thought he was_______, for he seems to be in his thirties.
--You used to be quiet, ____you? --Yes, and I used to be very shy.
-- How do you study a test? -- I studylistening to tapes.
--What’s the matter? --They said I shouldn’t be allowed here. They don’t allowin the waiting room.
--Listen! Tom is singing in the next room. --It _______ be Tom. He has gone to Shanghai.
--Mary hasn’t paid for the school things, has she ? --______. Her mother will pay for her.