Please ________ the light when you leave the room.

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完形填空：阅读下面短文，掌握其大意，然后从每空所给四个选项中选出最佳答案。

At one of the schools in London, the students can go into town in the afternoon. But they must 1 to the school before six. One afternoon, Bob went to see a film. When he came back to the school, the school gate had already been closed. He went around the building to 2 door. That one was closed, too. Then he saw an open window on the 3 floor. It was the 4 office. Bob looked 5 the room, but no one was in. He quickly 6 into the room. Just then he heard a voice. Bob looked round and hid (躲藏) himself 7 a chair. Then the headteacher came in and sat down on the chair. He read a book for an hour. At last the headteacher stood up and went towards the door, “Thank goodness, he didn't 8 me.” Bob thought. 9 he left the room, the headteacher spoke to the chair, “Would you please 10 the light when you leave?”

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