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：⒈每处错误及其修改均仅限一词；

⒉只允许修改10处，多者（从第11处起）不计分。

    My little brother was almost three years old while I took him to the post office in our town for a first time. As I fill out my return receipt form, my brother looked around at another people in line. I noticed him staring at the pictures on the wall. "Who is the people on the wall?" he asked. I explained patiently him that they were bad people that the police were bad people that the police were searching for them. My brother looked up at me with the sweetest face but asked curiously, "Then why didn't they keep them when take their pictures?" I was complete without words.