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。错误涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏词符号（∧），并在其下面写出该词。
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。
Of all my teachers, Mr. Smith is one who impresses me most. Although he is 40 and ordinary, but he looks very young. And he is one of the most popular teacher in our school. Compared with other teachers, he paid more attention to his way of teaching. He tries various ways make his classes interesting. In her opinion, we should not only know “what” but also understanding “why”. So, instead of giving us answers immediate, he encourages us to think by ourselves when he puts forward
questions. Under his help, we have learned how to analyze and settle problems. How a wonderful world of “why” he leads us to!