—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
—Susan has bought a large house with a swimming pool.
—It ______ be very expensive. I never even dream about it.
A．must B．might
C．can’t D．shouldn’t
—I’m a little tired. Let’s go to the zoo by taxi.
—We take a taxi. It’s not far from here.
A．can’t B．mustn’t
C．couldn’t D．needn’t
—Another cup of coffee?
—No, thanks. I _____ be off. Mary is waiting for me.
A．can B．may
C．must D．might
