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。

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。

Dear Sophie,

    I am chairman of the Students^, Union of this school, deciding to prepare an English program to be holding in our school. There are some things we should do on advance. The first one is to choose student who perform well. The second one is that we should plan the program proper. The last one is your assist for us after your arrival, with which we were sure to perform better.

    I sincerely invite you join us to play a role and help us correct the script (剧本) as well as. With only twenty days leaving for the program, I hope he can give us timely help.

Yours,

Li Hua