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：在错的词下画横线，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。
Last Wednesday our class organized a environmental activity whose theme were "Join Together to Build a Civilized City" in a community. The students divided into three groups. We Group One went from door to door recycling the using things. The second group had cleared up the posters and advertisements on the walls as good as the rubbish on the ground. The last group handed out the magazine of the environmental protection and we also invited the residents to take part. The local praised us with our practice and gave us much appreciation，it made us all feel happy.
