—Listen ! Helen is singing in the next room.—It _______ be Helen. She has gone to Beijing.
He looks sad. Let’s cheer him______.
Mary, you _____ be short, but now you are tall.
The boy is ________ to go to school.
—Could you tell me the way to the station? --Sorry, I don’t know the way to the station, ________
I really don’t mind if friends _______ the same clothes.