It’s high time that we students________ harder as the examination is drawing nearer.

— Tom is never late for work. Why is he absent today ?— Something _______ to him. 

The boss looked very worried and demanded that the work________before we went home.

—Shall I inform him of the change of the schedule right now? —I am afraid you _______,in case he comes late for the meeting.

— What does the notice on the wall say? — “No person _____ take books out of the reading room; otherwise he _____ be fined.”