假定英语课上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。每处错误仅涉及一个单词的增加、删除或修改。按下列情况改正：
删除：把多余的词用斜线(\)划掉。
增加：在缺词处加一个漏字符号（A)，写出该加的词。
修改:在错的词下画一横线，写出改正后的词。
注意:每处错误及其修改均仅限一词；只允许修改10处，多者(从第11处起)不计分。
Bill worked in big office, and he usually went to the barber's during working hours to have his hair cut. This against the rules： office workers had to have his hair cut in their own time. While Bill was at the barber's on one day, the manager of the office entered in to have his own hair cut. Bill saw him and managed to hide his face. But the manager sat besides him, and soon recognized him. "Hello, Bill," said the manager, "I know you are having your haircut. ""Yes, sir, I do, said Bill. "You see, sir, it grows in office time. " "Not all of it，" said the manager at once. "Some grow in your own time. " "Yes, sir, that's quite true," answered Bill polite, "but I'm not having it all cut off. "