短文改错There is no doubt whether birds are our friends. Therefore, a large number of birds are killed f

短文改错（共10小题；每小题1分，满分10分）
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。
There is no doubt whether birds are our friends. Therefore, a large number of birds are killed for food every year, that really causes more and more people to be worried. The other day I was walking in the woods when the shot was heard. Hearing the shot, the birds in the trees fly in all directions. A bird was bad injured and looked sad. Find the bird injured, I decided to take it home. At home I took good care for it. When it recovered, so I returned it to the woods. I hope something can be done to protect birds from killed.
【答案】1. whether→that
2. Therefore→However
3. that →which
4. the →a
5. fly→flew
6. bad→badly
7. Find →Finding
8. for→of
9. so去掉