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，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限一词。

2. 只允许修改10处，多者（从第11处起）不计分。

A kind of little cars may someday take place of today’s big ones. If people drive such cars in the future, there would be less pollution in the air. There will be more spaces for parking cars in cities. The streets will be less crowd. And driving will be safe as these little cars can go only 65 km per hour. The future cars will be fine for getting round a city, so they will not be useful for long trips. Little cars w ill go 200 km before needing to stop for more gases. If big cars are still used along with the small ones, two sets of roads will be needed in the future. Some roads will be used for the big fast cars and another roads will be needed for the slow small ones. It is said that three so little cars can fit in with the space now needed for one car of the usual size.