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。每处错误仅涉及一个单词的增加、删除和修改。
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。
People who are near-sighted can only look things that are very close to their eyes. Everything before their eyes seem unclear. Many people do a lot of close work, writing, reading and sewing become near-sighted. So they have to wear glass so as to see distance objects clearly. People who are far-sighted suffered from just the opposite problem. Although they can't see things that are far away, they have difficulty reading a book if they hold them at an arm's length. If they want to do many reading, they have to wear glasses, too. Other people do not see clearly because of their eyes aren't exactly of the right shape.