---Who cleaned the blackboard yesterday, Dick?---John ____.
— Must I come at four o’clock? — Oh, no, you ____.
It’s too cold .You had better ______your coat.
.-Would you mind ____ the window ? --Of course not.I feel hot,too.
You should not eat _______ meat. It can make you fatter.
—He plays basketball so well! Who taught _______? —He learnt it by _______.