假定英语课上老师要求同桌之间修改作文，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（∧），并在其下面写出该加的词。
删除：把多余的词用斜钱（\）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10处，多者（从第11处起）不计分。
The day before yesterday, my classmates and me went to the park near my school. Can you guess that what we did there? Nor for amusement but to take part a volunteer task. We reached a park at nine o’clock. The whole class divided into three groups. Group One planted trees and water flowers. Group Two picked up litter leaving by tourists and cleaned all the benches. The group which I was in wiped all the equipments in the Children’s Playground. All of us worked hardly. Before noon we finished working. Each of us felt a little bit tired, so we were happy because we had done a good deed.