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。错误涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏词符号（∧），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。
It was fine last Sunday and all the students in our class go to the suburb of our city to plant tree. On arriving the planting place at 8 o’clock, the teacher asked every of us to plant 5 trees at least. Then we set out digging, planting and watering. All of us were working hardly to finish our task, afraid of falling behind. Among us, our monitor set a good example to us. Despite his illness, he accepted his task and finished it ahead of the time. Then he went on to help other without any rest. After work, he was wet all over. He looked pale and full of joy. Look at lines of the young trees, we smiled pleasantly.