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：把多余的词作斜线（\）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。
Dear Robert,
Thank for your letter of May 12^th . How glad I was when I get it. I’d
be very happy to be your pen friends. Now allow me introduce myself to
you. I’m a boy student aged seventeen, study in Senior Three of Hongqi
High School. I’m a monitor of my class. I am about to take the National
Matriculation Entrance Test after twenty days, that is, between June
7 and 8．You know, I want very much to be a doctor working for poor
peasants that I try to make fully use of every hour and study far into
the night every day.
Best wishes！ 
Yours truly,
Li Hua