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

It has been announced that students         remain in their seats until all the papers have been collected.

You __________ tell anyone about this — it’s a secret.

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

—Why are those people gathering in the middle of the street?—I don’t know. There ________ be an accident.