假定英语课上英语老师要求同桌之间互相修改作文，请你修改你同桌的以下作文。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。
删除：把多余的词用斜线（\）划掉。
增加：在缺词处加一个漏字符号（∧），并在该词下面写出该加的词。
修改：在错的词下划一横线，在该词下面写出修改后的词。
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11处起）不计分。
My brother Tom was very selfish when he was a little boy. He didn't want share things with other people. For example，when he bought a chocolate cake，he put them in a secret place where I couldn't find. Then he eats it all by himself. He never helped other. He said he is busy. That is，a game of tennis making him very busy. He didn't care if something he did made people angrily. For instance，on a cold night he played strong and loudly music till 4 o'clock in the morning. But he is difference now. He often helps Grandma with housework，Mom with cooking and his classmates with their lessons.