If the green light doesn’t come on, you ______ go across the street.

Have you been to the Great Wall?－Perhaps not in my memory. _______ , it might have been during my early childhood.

It is not impossible _the important work on time.[ ]

Is Jim coming by train?— I’m not sure. He_____ drive his car.

Your mother _______ take a bus to work?-Yes. But now she usually goes to work on foot.