－Mom, I’m leaving. －It’s raining. You’d better ________ an umbrella with you. 

——I haven’t got a camera.——I think you should buy_______. It’s useful for you.

—I’m going to New York this evening. Is there a flight to New York then?—There____ be a flight. But you’d better call the booking office to make sure.

—________ you leave your room in such a mess?—Sorry，Mum.I forgot to tidy it up.

________I smoke   here ?----No. you can’t.