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。
Of all my teachers, Mr Smith is the one who impresses me most. Because he is 54, he looks very young at his age. And he is one of a most popular teachers in our school. Compared with other teacher, Mr Smith pays more attention to his way of teaching. He tries various ways to make his class lively and interestingly. In his opinion, we should not only know "what", but also understand "why". So, instead of give us answers immediately, he encourages us to think by themselves whenever he puts forward questions. With his help, we have learned how analyze and settle down problems. What a wonderful world of "why" he leads us to! He is so a learned person that we all admire him very much.
