下面文中共有8处语言错误，要求你在错误的地方增加、删除或修改某个单词。
增加：在缺词处加一个漏词符号（/\），并在该句下面写出该加的词。
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8处，多者（从第9处起）不计分。
Dear David,
I’m glad that you’ve noticed our efforts directed towards environmental protection. Thanks you for your concern.
As too much use of plastic bags have caused serious white pollution, our government encourages us to use environment-friendly shopping bags. These bags are made of a variety materials that can be easily treated when they become rubbish. Besides, it can be reused. More and more people in China have realized the advantages of such bags but started using them.
I believe that the widely use of these shopping bags can greatly improve our environment. This is one of the many more steps we are taking to make our country an even clean place.
Yours,
Li Hua
