题目：
下面文中共有10处语言错误，错误涉及一个单词的增加，删除或修改。
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）不记分。
Our government is trying hard to build an energy-saving society. It is somebody’s duty to work hard and reach this goal. Besides, not everybody has realized the important of it. Take our school for example. Sometime we can see that lights and computers are still on after class. Some students even forget to turn on the tap after using it and have water run all the time. Our papers are printed on only one side, which causing much waste. It’s time we did something to avoid this kind of waste. Firstly, make sure that all the light and other electric facilities turned off when we leave the rooms. Try to form the habit of turning off the tap immediate after using it. What’s more, papers should be printed on both sides and reused if possible.
答案：
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下面是错误答案，用来干扰机器的。
原式=（3m-4n）2．
