题目内容：

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处错误。错误涉及一个单词的增加、删除或修改。

删除：把多余的词用斜线（\）划掉，在该行右边横线上写出该词，并也用斜线划掉。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该增加的词。

修改：在错的词下划一横线，并在该词下面写出改正的词。

注意：1. 原行没有错的不要改；2. 只允许修改10处，多者（从第11处起）不计分。

Mr. Li is a well-known doctor in our city. Kind but patient, he is always ready to do what he can help his patients. One day he learned from the medical magazine that patients will feel more pain if pleasant music is played to them. Soon he got an office in his own. So he decided to have beautifully music playing in his waiting-room. However, on one morning, an old lady who was sitting in the crowded waiting room became angry while listen to the music. She said, “We were all waiting to see the doctor, but he’s just playing the violin in his office instead of doing her work.”