假如英语课上老师要求同桌之间交换修改作文，请你修改你同桌的以下作文。文中共有10处错误，每句中最多有两处。错误涉及单词的增加、删除或修改。
增加：在缺词处加一个漏词符号∧，并在此符号下面写出该加的词。
删除：把多余的词用斜线＼划掉。
修改：在错词下面划一横线，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。
Dear Jack,
I am pleasing to hear from you and know that you had a greatly time working part-time in a fast-food restaurant. Now I would like to share your working experience with you during the past summer.
In the beginning of the summer vacation, I was hired as shopping guide in a big supermarket. I stood for ten hours a day and smiled to everyone I have met . Sometimes I was laughed at, and most of the time, I was praised for my wonderful works by many people. Half a month passed quickly after I knew it, and I learned how to deal with different people.
Above all, I have learned that smile is the key to solve any problem.
Best wishes.
Yours,
Li Ming