—Why are those people gathering in the middle of the street?—I don’t know. There ________ be an accident.

You __________ tell anyone about this — it’s a secret.

--- Where is Jack? I can’t find him anywhere.--- He ______ his homework upstairs.

Often he______ sit for hours doing nothing at all when he was in low spirits.

If you want to book tickets for the 2012 Olympic Games, just call 00952012．It ______ be simpler．

—How did you like the concert last night ?—I enjoyed it very much, but the dancers _____ a better job．

My car is covered with thick snow and now the engine simply ______ start.

Though _______ money, his parents managed to send him abroad.

-----Who has made a mess in my room? -----Who else         it but your naughty son?

John, look at the time._____ you play the piano at such a late hour?

--- May I smoke here? --- If you       , choose a seat in the smoking section.

–Will you read me a story, Mummy? --OK. You ______have one if you go to bed as soon as possible.

Tommy, you____ be hooked on the Internet all day. You may fall behind others in study.

—Some countries are taking action to occupy the islands of the South China Sea.—Yes, but I think they ____be punished sooner or later.

—I didn’t tell him the news.—Oh, you ought _______.

—Are you going to help him?—Why  ___ I help him? He' s never done anything for me．

--- Are you in a hurry? --- No, in fact, I’ve got plenty of time. I _______ wait.

Mary __________ the job he offered to her, but she didn’t.

—Hi, Johnson, any idea where Susan is?—It's class time, so she       in the classroom now.

I ______ her, but I never could.