There is a “ No smoking “ sign here. You _________ smoke.

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

Hurry up, or you ______ catch the train. 

—Do you know whose dictionary it is?—It ________ be Ann’s. Look! Her name is on the first page.

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