题目内容：

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(＼)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。

As middle school student, not only should we acquire knowledge but also we should have good qualities. I think express our gratitude to people who helped us is one of the good qualities we must have. Two years before, my classmate, Wang Wei ran into difficulty because his father is diagnosed with lung cancer. His father’s illness added to his family?s trouble, but Wang Wei was in danger dropping out of school. After learning about his bad situation, our head teacher gave him timely help by allowing him to continue his schooling with any tuition．With the help of the teacher and classmates，Wang had finished school．Just before this important exam he wrote us a letter expressing his sincerely thanks for all what we have done．