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：在错的词下画一横线，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。

    Edison was a great scientist or inventor. As may not be known to many people, born in a peasant families, he received few school education. He started to go to school at age of eight and remain at school for only three months. It's said that he always asked some strange questions which his teachers couldn't answer them. In fact, he was a man full with imagination. He made over 2,000 inventions in his life, covered many fields, such as the electric lamp, film, etc. He played an important part to the social develop and the progress of human beings.