假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文. 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:在错的词下面画一横线,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.
This afternoon our class organized a social task in the nearby park. On arriving there, we are divided with three groups. The first group collected the rubbish throwing by visitors, such as waste paper, cigarette ends, plastic bags and so on. Meanwhile, a second group set up several bulletins（广告牌） to ask visitors to take care of the flowers and tree in the park. The last group gave out leaflets(传单） to visitors, reminding them of the danger of “white pollution” but the important of environmental protection.
In my eyes, that is very important for us to protect our environment. For the sake of people’s healthy and happiness, active measures should be taken to control and to prevent pollution and everyone should make contributions to it.