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。
There is an extremely annoyed phenomenon that much students litter in our school. Not only is it bad for our healthy but it also makes our school less and less beautiful. Therefore, our school is going to hold an activity calls "Stop Littering in Our School". The activity will sure leave an unforgettable impression on those who take part in. In the activity, we will first to walk around the school to see what serious the littering problem is. After that, we will be divided into groups to pick up rubbishes. Through this activity, we are expected to realize the importance of protecting the living environment in our school but stop littering in our school.
