II. 短文改错 (10处，每处0.5分，满分5分)
假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌的一下作文。文中共有10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（∧），并在下面写出该加的词。
删除：把多余的词用（\）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,多者（从第11处起）不计分；
2.只允许修改10处。
As we all know, the frightening sandstorms had a bad effect in people’s life in Northwest China in the past. On the one hand, that was difficult for people to travel in the flying dust, and which also caused damages to their health. On the other hand, many rich fields and forests were covered with sand before sandstorms. And many roads and houses were even complete destroyed by sandstorms.
To our great joy, many measures have taken to protect the environment against sandstorms. For example, many fields have been planting with trees to prevent the soil from flowing away. Besides, many people immigrated as planned to other places, which they live in their new houses with the help of the government.
In my opinion, all these measures are necessary, and only when they are fully carried out we protect the environment well.