短文改错 (共10小题；每小题1分，满分10分)
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，并在其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。
This term we have a new English teacher, Mr. Zheng, which often says, “A good teacher
should be a person who does all that he can make himself unnecessary.” At the beginning,
we all felt puzzling at his words, but gradually we came to accept Mr. Zheng as a greater
teacher. Above all, he has a special way to make ourselves interested in his class. Besides, he
always gave us some advice on what to learn English better. “The purpose of learning a
foreign language,” he said, “are to be able to use it freely in our daily life. Try your best to
practice English both in and out of class, you will surely make a great progress.”