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。
In the past two years, our school had organized many activities. What impressed me most was an activity calling “Learning to Farm”. In an autumn afternoon, we went to the farm, where we learned to plant potatoes. Having been in the city for such a long time, we are so happy to go to the countryside. After we got there, we were divided into three groups, we started to work. Some students cut potatoes into pieces, some dug hole, and the others put the pieces of potatoes into the holes, put the earth back and pushed them down hard. We were all busy working as all the work was done. Though we were tired out, we felt pleased on our way back to home.
