一段英文翻译at one of the school in london,the students can go int

一段英文翻译
at one of the school in london,the students can go into town in the afternoon.but they must return to the school before six.one afternoon,tim went school gate had already been closed. he went around the building to the other door.that one was closed,too. then he saw an open window on the first floor.it was the head teacher's office.tim looked into the room,but no one was in.he quickly climbed into the room.just then he heard a voice,tim looked around and hid himself behind a big chair.then the head teacher came in and sat down in the chair,he read a book for an hour.