短文改错(共10小题，每小题l分，满分l0分)
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l0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l0处，多者从第11处不计分
When I was an elementary school student aging 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 asked me to 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．
