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：在错的词下画一横线，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。
I was taking a walk with my mother while I noticed some litter on the sidewalk on last Monday. I knew it was time to take action. So on their way home, we decided to doing some clean-up work. I took a picker and my mother hold a big rubbish bag. Together we did litter pickup on the sidewalk. I was surprising that the bag filled up so quickly. Then we threw into the roadside dustbin and repeated the process two more time. It gave us a sense of achieve to know we did what we could for Mother Earth. We were determined to do so consistent, maybe once a week.
