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 petition in our city. This 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 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.was后加 an
网友回答
(答案→)was后加 an
解析：
【小题1】elementary school student是可数名词，加不定冠词：was后加 an
【小题2】在某一天用on，In the day 改为On the day
【小题3】enter是及物动词，不加介词;去掉into
【小题4】考查定语从句定语从句中不缺成分，which 改成where
【小题5】这篇文章用的是过去时：asks 改成asked
【小题6】考查现在分词做状语，I和follow是主动关系，followed 改成 following
【小题7】考查形容词，这里没有和谁比较，不用比较级：better 改成well
【小题8】前面说自己认为唱得很好，后面是妈妈的话，表示转折：So 改成But
【小题9】walk out of走出;out后加 of
【小题10】主句是I realized从句的谓语是过去式：forget 为forgot