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。
Once upon a time, where there was a little boy naming Sima Guang. One day, he played with some boys near a big tank in front of the house. One of the boy wanted to hide himself in a tank. He thought somebody could find him if he hid in it. And he didn't know the tank was full of water. When he climbed to the top, he fell into the tank. The other boys ran to ask help at once. But Sima Guang didn't. He stood there, thinking hardly. Then he had a good idea. Quickly, he picked up a big stone and break the tank. In this way, Sima Guang saved the boy. How a clever boy!
