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。错误涉及一个单词的增加、删除或修改。务必按照以下要求的格式修改，否则不得分。
增加：在缺词处加一个下漏词符号（∧），并在其下面写出修改的词。
删除：把多余的词用从左上向右下的斜线（\）划掉即可。
修改：在错的词下面划一横线（_____），并在该词下面写出修改的词。
注意：1. 每处错误及修改均仅限一词；
2. 只允许修改10处，多者（从第11处起）不计分。
Peter Judd joined in the army when he was eighteen, and for several months he was
taught how to be a good soldier. He did quite good in everything except shooting. One
day he and his friends were practice shooting, and all of them were doing quite well
besides Peter. After he had shot at the target nine times and had not hit him once, the
officer who was trying to teach the young soldiers shoot said, “You’re quite hopeless.
Peter! Don’t waste your last bullet，too! Go behind that wall and shoot yourself with it!”
Peter felt shameful. He went behind the wall, and a few seconds later the officer and
the other young soldier heard the sound of a shot.
“Heavens!” the officer said, “Has that silly man really shot himself?”
He ran behind the wall anxiously, but Peter is all right. “I'm sorry, sir.” he said, “and
I missed again.”