短文改错（共10小题；每小题1分，满分10分）
英语课上，老师要求同桌同学相互修改作文。假设以下小作文为你同桌所写，请你对其进行修改。文中共有10处错误，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（^），在该行右边横线上写出该加的词。
删除：把多余的词用斜线（/）划掉。
修改：在错的词下划一横线，在该行右边横线上写出改正后的词。
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。
3．必须按答题要求做题，否则不给分。
Music is one of the arts. It is like the speaking language, but it uses sounds. Who invented music? Who sing the first song? No one knows exactly the answers of these questions. But we know that music play an important part in almost everyone’s life. Baby and young children love to hear people singing to them. When they are a little old, they like to sing the songs they have heard. When children go to the school, their world of music grows. In the middle grades students take music lessons. When they reach high school, we become interested in listening pop music. Music has meaning for everyone. It can make people happy but it can make them sad.