Last night Li Ping watched the football match at my home, so he________ in his office. 

 No student ______ go out of the school campus after 10:00 at night without permission according to the school regulations.

—There's someone knocking on the door．Who        it be?—It must be Mary．She promised to be here at 8：00．

Tom, you ____ leave all your clothes on the floor like this.

—Oh, my God！Our teacher is so mean!—Calm down, my friend.Even though she is tough  sometimes, she ________ be nice if you really work hard.