Sometimes the boy is a bad-tempered child, but he ____ be quite lovely when he wishes．

— Who’s singing in the next room?— It ____ be her . She has gone to New York.

You _______ cross the road when the traffic lights are red.

 After you read the article “Why fast food is slowly killing you”, you         stop eating fast food. 

— Mum, would you please buy me an MP5 player? — If you can help do the dishes the whole vacation, you ______ have one as a reward.