假如英语课上老师要求同学们交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，要求你在错误的地方增加、删除或修改某个单词。
增加：在缺词处加一个漏字符号（＾）, 并在此符号下面写出该加的词。
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、只允许修改十处, 多者（从第11处起）不计分。
When I was an elementary school student aging ten, I took part in a singing competition in our city. It was my first time to be in a singing competition. In the day of the competition, I was asked to enter into a studio room, which there was only one person and a piano. The man asked me  sing in front of the microphone, following his piano playing. My mother was waiting for me outside the studio. I thought that I sang better at the time. So when I finished and walked out the studio, my mother asked, “What happened to your voices? Why couldn’t we hear you?” Then, I realized that I forget to switch on the microphone.