短文改错 （共10小题，每题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。
Walter's goal in life was bee a successfully doctor. He knew he had to finish high school first, so he puts his heart into his studies — in particular, biology, chemistry, or maths. Because he worked hard at these subjects, Walter became good at it. However, Walter forgot what he needed to master some other subjects besides those he had been chosen. As a result, Walter failed both English and Latin in the end of the second school year. But he had to repeat these subjects and he was almost unable to graduate like planned. Walter learned a good lesson.
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解析：
【小题1】考查动词。这里是不定式作表语to bee.
【小题2】考查形容词。successfully是副词；successful是形容词，这里用来修饰名词。
【小题3】考查动词。根据so前的句子的时态可知应该用过去式，故用put.
【小题4】考查连词。or表示前后是选择关系；and表示前后是并列关系。
【小题5】考查代词。这里用them代替的复数名词subjects.
【小题6】考查连词。这里是宾语从句，what在从句中应该作宾语，而这里不缺宾语，所以用that或省略that.
【小题7】考查动词的语态。这里he had been chosen 是定语从句，he 与chose之间是主动关系，故去掉been.
【小题8】考查固定短语。at the end of在……结束时，是固定短语。
【小题9】考查连词。but表示前后是转折关系；so表示前后是因果关系。
【小题10】考查连词。like像，例如；as是连词正如。