短文改错（共10小题; 每小题1分, 共10分） If you walk around in some public place, 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 show that many kinds of diseases have anything to do with smoking. Smoking itself is a waste, that costs one 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.