—Boy, you _______ lean (伸) out of the window while the bus is running. That’s dangerous.—Sorry, I won’t do that again.

—Must I clean my room now, Mum?—_______. You can do it tomorrow.

You'd better ____ football in the street.

The bicycle looks much like mine, but it isn’t.        it be John’s?

—I can’t stop smoking, doctor.— For your health, I’m afraid you________.