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：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10处，多者（从第11处起）不计分
We are required to collect our smart phones and keep it in the teacher's during the weekdays. In fact the most of us obey this regulation, but some still play various trick against it. I'm among those. Once, I hand in a waste phone. Mr. Li, our head teacher, seemed ignore all that. So I felt very luckily to have an extra phone with me. And good times don't last long. "Can I use your phone as a while? I forgot to take mine by chance." Mr. Li said, pick out my waste phone and dialing. You can see how embarrassing I was at the scene!
