题目内容：

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。

My father is a policeman. On a cold winter evening, he saw old beggar sitting in a square outside a shopping center. His shoes had been worn out and his toes stick out. See his frozen feet, my father felt sad. He left and returned back with a pair of new shoes and socks, that he bought at a nearby store. He knelt down on the ground but helped the old homeless man put it on. His random act of kindness melted the hearts of the passer-by. A woman brought an old blanket from her house to protect the beggar with the freezing cold. The beggar was touched and said it was nice to know that angels true walk on earth.