--- Listen! David is talking happily with his mother in the next room.--- It ______ be his mother. She has gone to Yunnan to be a volunteer doctor.
---_____ do you go to the cinema?--- Three times a month.
Who buys a nice present?
---Where’s Uncle Wang?---He’s sitting______the bus. He’s the driver.
---Whose ball is this? ---It’s _____.
This is _______ old football. I like playing _______ football very much.