—Could you please come to the museum with me this afternoon?
—Sorry，I ________．I have to take a piano lesson at 2 pm．

--- ______ you give your seat to this old man?
--- Of course.

—Dad, must I do my homework now?
—No. You_____play games with your friends for a little while.

--Listen! Kate is playing the piano in the next room.
　　--It _______________be Kate. She has gone to Hangzhou to visit the Cross-sea Bridge.

--Just a minute. I’ll go to get some apples for you.
--Thanks, but you      get too many. One is enough.

Today’s work ____ today. Never leave it till tomorrow.

—To make our city more beautiful, rubbish         into the river.
—I agree.

--Let’s go to the Tian’anmen Square by taxi.
--Oh, it’s not far from here. We_______ take a taxi.

------What kind of house do you want to have? Something big ?
------Well, it _______ be big.—That’s not important.

.Susan’s parents have bought a large house with a swimming pool. It ______be very expensive.