At one of the schools in London, the students can go into town in the afternoon. But they must     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    door. That one was closed, too. Then he saw an open window on the       floor. It was the      office, Bob looked         the room, but no one was in. He quickly      into the room. Just then he heard a voice. Bob looked round and hid himself    a chair. Then the head teacher came in and sat down on the chair. He read a book for an hour. At last the head teacher stood up and went towards the door. “Thank goodness, he didn't         me.” Bob thought.        he left the room, the head teacher said to the chair, “Would you please    the lights when you leave?”
A．come               B．go               C．return
A．the other           B．another          C．small
A．first               B．second           C．third
A. teacher's          B. head teacher’s         C. students'
A．at                 B．out of           C．into
A．climbed            B．went             C．ran
A．behind           B．in front of     C．beside
A．see                B．hear             C．find
A．As soon as         B．After            C．Before
A．turn off         B．turn on          C．turn down