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 petition in our city. It was my first time to be in a singing petition. In the day of the petition, 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.aging--- aged
网友回答
(答案→)aging--- aged
解析：
【小题1】aging--- aged 用形容词aged修饰名词student.
【小题2】 In-- On 具体到某一天使用介词on。
【小题3】去掉enter后 into enter是及物动词，后面要直接加宾语，不需要介词。
【小题4】 which----where 后面的定语从句很完整，要使用关系副词where。
【小题5】在me后加to 固定词组ask sb to do sth要求某人做某事
【小题6】 So----But 根据上下文的意思可知之间存在着转折的关系。
【小题7】out----of 固定词组out of；walk out of…走出….
【小题8】 voices----voice voice是不可数名词，没有复数的形式。
【小题9】 we---I 这句话是妈妈说的，妈妈说她无法听见我的声音。在直接引语中用I表示。
【小题10】 forget----forgot 我忘记打开麦克风是之前发生的事情，使用过去时。