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。（10分）
增加：在缺词处加一个漏字符号（∧），并在下面写出修改后的词。
删除：把多余的词用斜线（\）划掉。
修改：在错的词下画一横线，并在该词下面写出修改后的词。
注意：1）每处错误及修改均仅限一词。
2）只允许修改10处，多者（从第11处起）不计分。
Dear Sally,
Now I'd like to tell you something about my part-time job this summer vacation, of which I worked like a guide in a travel agency.The work was interesting but tired. I think it was helpful to work this holiday. It was the first time that I have earned money on my own.I've come to understand how hard my parents work to support for the family. I used to keep on ask them for money, but now I'll never waste money and learn to share worry with my parent. I've learnt how to get along well with others.
What's worse, I've gained some working and social experience and I have learnt something can' t be learnt from textbooks. All these will be good for my future. In a word, I had the wonderful and valuable summer vacation.
Yours,
Li Bing
. ”Dad told me before I went abroad.