去掉who 7. But→So 8. either→also 9. lived→live 10. We→They No. 3 Recently, a number of private cars has been increasing rapid in our country. In 1990, there were about a million private cars. With time went on, the number rose to five million in 1999. There were 10 million of private cars in 2004. As we know, it was convenient if we’ve a car. Beside, the increase of the number of private cars can help car industry to developing faster. However, more cars may cause more traffic accidents and air pollutions. What’s more, waste gases from cars can make great harm to our health. It’s time that people paid attention these problems. 【
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