短文改错（共10小题，每小题1分，满分10分）
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。
Walter’s goal in life was bee a successfully doctor. He knew he had to finish high school first, so he put his heart into her studies----in particular, biology, chemistry and maths. Because he worked hard at these subjects, Walter became good at it. However, Walter forgot that he needed to master some other subjects beside those he had been chosen. As a result, Walter fails in both English and Chinese 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：
第一句话有两个错，一是要用不定式做表语，在bee前加to，第二处错是successfully改成successful，因为这里是形容词做定语。
第二句话里人称不一致，前面是his后面是her，这里统一改成his。
第三句里指示代词用的不对，应该用them代替前面出现的subjects。
第四句里的beside改成besides，前者是“在..旁”，后者是“除了”，不能混用。
第五句话里的动词时态错误，文章总的时间是过去式，应该前后一致，还有一处是介词的错误，在…结束时应该用at the end of..
第六话一处错是逻辑关系发生了错误，上下文是因果关系，要用so，另一处错是把like改成as，因为这里需要连词，而like表示像是介词。