水对人类的贡献有(    )。

文中共有10处语言错误，每句中最多有两处。每处错误仅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）不计分。

    A man requested on a wise man to help his son quit his bad habits. The wise man took the boy for walk in a garden. Suddenly he stopped to ask the boy to pull out a tiny plant there. The boy hold the plant between his thumb and forefingers and pulled it out. The man then asked him to pull out another plant what was a little big. The boy pulled hardly and the plant came out. “Now pull out that one,” said the man point to a bush. The boy tried his best but couldn't pull it out. “So it is the same with bad habits” said the wise man. “When you are weak, it is easy to pull them out, though when they become strong, they can't be rooted.”