短文改错 (共10分,每小题1分,满分10分)
该文中共有十处错误,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：在缺词处加一个漏字符号(∧), 并在此符号下面写出该加的词。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、只允许修改十处, 多者(从第11处起) 不计分。
As is well-known that birds are our friends. But the large number of birds have been killed for food. The other day I was walking in the woods while a shot was heard. Hearing the shot, the bird in the trees flew to all directions. A bird was injured badly and looked sadly . Finding the bird injured, so I decided to take it home . At home I take good care of it .When it recovered, I returned itself to the woods .I hope something should be done to prevent birds from killed.