假如英语课上老师要求同桌之间交换修改作文，请你修改你同桌的以下作文。文中共有10处错误，每句中最多有两处。错误涉及单词的增加、删除或修改。
增加：在缺词处加一个漏词符号∧，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：在错词下面划一横线，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处不计分
When I was elementary school student aged ten, I took part in a singing competition in our city. This 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 asks me to sing in front of the microphone, followed 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 voice? Why couldn’t we hear you?” Then, I realized that I forget to switch on the microphone.