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。
Yesterday a school boy is daydreaming in class. Not knowing that he was doing, he put a pen cap into his mouth. A few minutes late, he was terrified to find that he had swallowed it! The teacher was shocking when the boy stood up and said, “I've just swallowed a pen cap.” He was quickly sent the nearest hospital. There a doctor examined him and said the best treatment was to take some medicines so that the pen cap could pass natural. Three hours later the boy successfully made it.“She is really lucky，” said the doctor. “It's not rare that small children put things into their mouths for a fun. It's very danger.”