增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。
删减：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处起）不计分。
Last Friday, our school organized us to a fire station, what we had expected for several day. When we got there, the fire-fighters welcomed us but led us into an exhibition hall. There one of them delivered the lecture on fire control to us. After that, they show us how to operate a fire extinguisher, and even gave our chances to practise using it. Now, I dare say I can use it skillful! On our way home, we couldn't help to talking about what we had experienced. We felt very happy and excited because we had gained so many knowledge about fire control and known what to do an emergency.
