15．假定英語課上老師要求同桌之間交換修改作文，請你修改你同桌寫的以下作文．文中共有10處語言錯誤，每句中最多有兩處．錯誤涉及一個單詞的增加、刪除或修改．
增加：在缺詞處加一個漏字符號（∧），并在其下面寫出該加的詞．
刪除：把多余的詞用斜線（\）劃掉．
修改：在錯的詞下劃一橫線，并在該詞下面寫出修改后的詞．
注意：1．每處錯誤及其修改均僅限一詞；
2．只允許修改10處，多者（從第11處起）不計分．
A college graduate was new in the job and she found something really strange．One of her colleague was a lazy man，who usually played his digital camera or listen to music during working time．To her surprised，the boss never blamed him because his behavior．
One day，her colleague was listening to the music while the boss came and said serious，"the host computer has something wrong．"The colleague rushed to the controlling center to solving the problem and began to fix them silently．Twenty minutes later，and the host computer reworked normally．Then the graduate realized the economic loss what her colleague had saved this time must have been hundreds of his salary．
