It is required that under no circumstances ______ betray ourselves even if there are temptations like money or beauty.

 –Dad, _____ we wait until the light becomes green?--Yes, we ______ . That’s the traffic rule.

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

--Whose tennis racket is this, Linda?--Look! Jerry's name is on it! It _________ be his.

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