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。每处错误仅涉及一个单词的增加、删除或修改。
删除：把多余的词用斜线(\)划掉，在该行右边横线上写出该词，并也用斜线划掉。
增加：在缺词处加一个漏字符合(^)，在该行右边横线上写出该加的词。
修改：在错的词下划—横线，在该行右边横线上写出改正后的词。
注意：1.每处错误及其修改均仅限一词；
2.至允许修改10处，多者（从第11处起）不计分。
Over a year ago, my friend was ready to return after complete his tour in Singapore. He didn’t expect that he was about to get on his airplane when he stopped politely by one of the worker of the airport. He was told that he was not allowed to aboard. My friend had thought that there must be anything wrong with his ticket. The worker told him that was not his ticket but the book he hadn’t return to, which he had borrowed from a library, that caused the trouble. Certainly, my friend didn’t board but missed the flight. He wasn’t permitted to take the flight home a week late until he returned the book to the library.