We ________ fight against pollution.

A．may                    B．should

C．mustn’t                D．needn’t

—I have spent too much time playing computer games these days.

—I think so. You _____ stop, for your study and your health.

A．will               B．must

C．can                 D．may

If the traffic light is red, you ________ cross the road. It’s very dangerous.

A．don’t              B．mustn’t

C．needn’t             D．wouldn’t

—Let’s go to the concert tonight, Michael!

—Sorry, I _______. I have to help my mother with the housework

A．mustn’t             B．may not

C．needn’t             D．can’t

We hope that as many people as possible ________ join us for the charity show tomorrow.

A．need                B．can

C．must                D．should

—Excuse me, where are we going to have our class meeting?

—I’m not sure. Ask our monitor, please. He      know.

A．can                 B．may

C．need                D．shall

—______ you swim?

—Yes, but I’m not a good swimmer.

A．Can               B．May

C．Need              D．Must

—May I watch TV for a while？

—No, you _______. You have to finish your homework first.

A．shouldn’t           B．needn’t

C．mustn’t            D．won’t

—Can you play the piano?

—Yes, I _______. I often practice it on weekends.

A．needn’t              B．need

C．can’t               D．can

—Listen! Is Professor Johnson giving a report in the hall?

—No, it     be him. He has gone to Japan.

A．needn’t               B．may not

C．mustn’t               D．can’t