"Those responsible for the accident      be punished while those contributing to solving the problems be rewarded," promised the official then and there.

— _______ we clean the classroom at once?  — No, you _______. You _______ clean it after school. 

—Look! The man at the gate        be our headmaster. He stands there every morning.—No, it        be him. He is holding a meeting in the office now.

Zhanglin was lost in computer games during his last year in high school, otherwise he_______ a student at Beijing University. 

You _____ to the meeting this afternoon if you have something important to do.