—Oil is everywhere in this store, so you             know smoking is forbidden here.
—I’m sorry.
A. can     B. may    C. must

You    eat the soup if you don't like it.

—Look at the sign!
—Oh, I see.We _______ waste water.

—_________ I borrow your history book?
—Sure. Here you are.

— Good morning. I've got an appointment with Ms King in her office.
— Morning. You _______be Mr Jones. This way, please.

— May I do the homework tomorrow?
一 No, you______. You should hand in before class tomorrow.
A. mustn't    B. needn't           C. couldn't

I can’t go to the cinema with you because I  _______ stay here until my mother comes back.

If you have finished most of the work, you ______ start working so early tomorrow.

The talented boy _________ write lyrics when he was at the age of ten.
A. may                      B. could                   C. must

--Whose backpack is this?
---It            be Jim’s. Look, his student’s card is in it.