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（\）划拟。
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10处，多者（从第11处起）不计分。
The day when we returned to school was impressive. Because the COVID-19 outbreak, we had to stay home during the three months' “vacation”. I was touching when I stepped into the school, where remained clean and neat. The staff must have worked hard to keep everything tidy and safe but we could study in a comfortable environment. There were sign telling us to wash hands frequently and wearing masks. Mr. Chen, our headteacher, greeted us warm in the classroom. A mask was covered most of his face, but his eyes were shining. He said we had done his part to stop the disease spreading. What a unforgettable day!
