题目内容：

短文改错

下面短文中有10处语言错误。请在有错误的地方增加、删除或修改某个单词。

增加：在缺词处加一个漏字符号（∧），并在其下面写上该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下画一横线，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。

Tom is one of my best friends at high school. We spent a lot of time together every day. We share a lot common. For example, we both work hardly and love sports. Although I am not so smart as her, we both do very well at school. Tom’s favorite subjects is history and Chinese, and he also speaks excellent English. I am used to be bad at English. Thank to his help, I have made a great progress in it. Yesterday, our English teacher said she decided to hold an English speech contest next week. I think a good chance to improve my English. Both Tom and I are looking forward to show our potential in the speech contest!