15．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仅限一词；
2．只允许修改10处，多者（从第11处起）不计分．
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．
