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）每处错误及其修改仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    “White pollution” was becoming g more and more serious. It is causing by plastic bags. In China about three billion plastic bags are used every a day, that results in a great waste of resources and heavy environmental pollution. Luckily, the government had forbidden people to using free plastic bags. The government demands all supermarkets should not provide customers to free plastic bags. This will undoubted reduce the use of plastic bags. But people should turn to cloth bags and baskets from now on. As students, we must try our best to use plastic bags again in order to keep “white pollution” off us campus.