These days students in some schools ______ not to use mobile phones. 

You must have your hair _____.

He          to wait for half an hour because of the bad traffic．

If you come to Hangzhou, you shouldn’t miss the show Impression West Lake! It is created by the famous director Zhang Yimou, and the actors’ performance __________on the water of the West Lake.

---You have found your lost umbrella, haven’t you?----Yes.I        it behind the door this afternoon.