It's necessary for you _______the classroom clean，class．（ ）
A．keepB．keepingC．to keep
—You_________ be happy with the strong public support you’ve received.
—Yes, you’re right. I’m really excited.
| A．may | B．can |
| C．must | D．need |
（）—Sandy, we need an actor for the action movie. __________ you play kungfu?
—Sorry, I can’t.
| A．Must | B．May |
| C．Should | D．Can |
---Who is making much noise?
---It ____ be Timmy. He is sleeping now.
| A．can’t | B．may not |
| C．mustn’t | D．couldn’t |
-- Must I write down all the new words now? No, you_______
| A．mustn’t | B．can’t |
| C．won’t | D．needn’t |
—Peter doesn’t mind lending you his camera.
—He _______. I’ve already borrowed one.
| A．can’t | B．mustn’t |
| C．doesn’t have to | D．may not |