增加：在缺词处加一个漏字符号(^)并在其下面写出该加的词。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
删除：把多余的词用斜线(\)划掉。
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。
Last Sunday morning, an earthquake strikes our town. I had never imagined put our training to use. When the alarm went off, I was much more calmer than I thought. I immediate went back to the classroom, asking my students to line up against the wall but fall on their knees. All my students followed my direction quickly. Luckily, earthquake didn't last long and none of us was injured. The experience learned of this incident made all the students become brave. And it can be used to preparing the students for the challenges what might happen in the future.
