leave
                    - ______ you leave so soon?-Yes. I have to catch my plane.
 - __________ we leave the library before 5 o’clock?— No, you needn’t. You can stay here until 5:30.
 - Are you going to Shanghai?— Yes, we Shanghai next Sunday.
 - Must I leave the room now?——No,you.
 - Rose, you leave your school things on the floor like this. Keep your room clean and tidy.
 - Before you leave the classroom, please the lights.
 - Must we leave now?-No, we ________. We still have two more hours.
 - I wonder when they ________ for Beijing. I will go to the train station to see them off when they _______.
 - You have to leave now _________ you can catch the early bus.
 - Tom has to leave now _________ he can catch the train.