增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。
删除：把多余的词用斜线(\)划掉。
修改：在错的词下画一横线，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处起)不计分。
Two years ago, the COVID-19 pandemic broke off in my city. Locking down in the school, we received great help and support from our teachers and medical workers. After entering the university, due to the repeatedly outbreaks, we were not allowed leave the campus freely. Although we missed out on lots of experiences, but we tried to have fun in our own way. We held a event called Free Hug", which aimed to show encourage to strangers on campus. I wear a mask and hugged many people that day. I were exhausted after standing for hours, but I knew their hearts were closer to each other.
