1 . 假定英语课上英语老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。
删除：把多余的词用斜线（＼）划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：1.每处错误及其修改均限一词。
2.只允许修改10处，多者（从第11处起）不计分。

It is a joke of the fire alarm. When Sophie was cleaning the blackboard after his class ended last night, the fire alarm went off. The alarm was sounded like the busy signal on the phone, but 1,000 times loud. Instead of leave the building, she walked about to see that the problem was. The school seemed to be empty. Then she walked by one room, but saw about seven students inside. She told everyone to leave immediate, and after almost five minutes, both of them left the building. Then a school police office arrived the school and walked around the area. He said it was a false alarm and used his key to turn down the alarm.