假定英语课上老师要求同桌之间交换修干作文，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：在错的次下划一横线，并在该词下面写出修改后的词。
注意：
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。
If you walk around in some public places, you will notice most of smokers are young people
and some are still middle school students . It is said that in China the number of people smoking
are about 45% . Why do so many people smoke? Some think smoking gives themselves pleasure.
Some even think that smoking can refresh them. In the fact, smoking is a bad habit that makes
great harm to people’s health . Studies of smoking shows that many kinds of diseases have   anything to do with smoking. Smoking itself is a waste, that costs one so much money. Besides
, many fires are often causing by careless smokers. Today more and more people all over the
world want to give up smoking . If you are not a smoker, never start.