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.每处错误及其修改均仅限一词；
2.只允许修改10处，多者（从第11处起）不计分。
March 12 was memorable because of our class had a meaningful experience on that day. On the morning, we bicycled to the suburbs to plant trees, talking and laughing all the way. Upon arrival, we began to work immediate. Some were digging holes. Some were carrying and plant trees. Others were watering it. After getting the work doing, we put up a board reminding people to protecting the trees. Before leaving we took some photo to record what we did. Seeing the lines of trees, we all had sense of achievement. This is necessary that we should do something to protect and beautify our environment.