题目内容：

假定英语课上老师要求同桌之间互相修改作文，请你修改你同桌写的以下作文。文中共有十处语言错误，每句中最多有两处。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。

Rain is of greatly importance to us.Without rain,our water supply would cut off and we would die,so would plants and animals.Therefore,too much rain does a lot of harm for us.It floods fields,towns and cities,cause great losses for us.So far man control over rain had never stopped.If we can gain more effective control over rain,we will enjoy more freedom from the nature.Luckily,we humans have taken steps,such as planting more trees or using weather forecasts,to help avoiding flood damage and protect our water supply.