题目内容：

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。

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。

I like riding my bike．Though it is not very new, but it is my best friend．I find very convenient to go anywhere with a bike．Riding gives me not only exercises but also pleasure．I use my bike almost in summer when the weather is warm and dry．It can be very pleasant in winter when it is cold and rain is pour down．It can also be very dangerous．Of course I will be very carefully on my bike．In fact, accidents are not the only problem．Once I went to bookstore on my mother’s bike to buy some books and come out to find the bike missing．Now I have two strong lock．