假定英语课上老师要求同桌之间交换修改作文，请您修改你同桌写的以下作文。文中共有10处错误，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：把多余的词用斜钱（\）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．只充许修改10处，多者（从第11处起）不计分。
（试题内容见答题卡）
Mr Zhang teaches us chemistry when we were in senior
Grade One. He was old, and he taught us good. He tried his
best to make his classes lively. Mr Zhang usually made good
preparations for the lesson and was strict to us, too.Whenever
we made mistakes in our homework，he would ask us to
correct it. I was used to be poorly in chemistry. Mr Zhang
often helped me with my studies very patiently. With his help,
I made a rapid progress and caught with the class. He was
always very kind to every student. As an experienced teacher,
he was respected and loved by all the students.
