—I can’t give up smoking, doctor.
—For your health, I’m afraid you ________.
A．may B．can
C．have to D．must
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
