根据下面短文内容，在短文的空格处填上一个恰当的词，使短文完整、通顺。
People usually check whether their keys, wallets and phones are with them _【小题1】 _ going out. But many people in Chain now have one more important thing to take, a face mask(面罩). They hope that it 【小题2】_ protect them from polluted air.
Since January, many cities in China have seen a lot of hazy(雾蒙蒙的)days. In Beijing, _【小题3】_ five days in January were free of smog(雾霾). People in Xi’an only saw a blue sky on one day in February. Smog is dirty air that _【小题4】_ like fog and smoke.
An official for the Ministry of Environmental Protection told Beijing News that PM2.5 pollution is the main problem with air pollution. PM2.5 refers to pollution with small particles(颗粒) of 2.5 micrometers(微米) or less in diameter(直径).
According to the Chinese Academy of Sciences, _【小题5】_ cars and burning coal(煤) are two major factors(原因) for PM2,5.
Poor air is _【小题6】 _ for people’s health, especially for children and the elderly. A report from Beijing Children’s Hospital shows that from Jan 5 to 11, half of the patients in the internal medicine department(内科门诊) are there for respiratory(呼吸) problems.
Air problems and environmental protection have bee a concern(关切的事) for the whole nation. Premier Wen Jiabao _【小题7】 his last Government Work Report on March 5. the report said that the government should work hard to prevent pollution and give people a _【小题8】_ living environment.
It calls on people to make full use of energy and resources and cut down on energy use.before
网友回答
(答案→)before
解析：这篇短文主要讨论了去年冬天发生的雾霾天气。文中重点介绍了北京和西安的雾霾天气，并分析了造成此种天气的原因及对人们健康的危害。
【小题1】联系上下文，可知此处指的是再出去以前。结合语境可知填介词before在……以前。
【小题2】联系下文，可知他们希望以此能保护他们免受空气污染的伤害。结合语境可知填情态动词can，能，能够。
【小题3】联系下文，可知在北京一月只有五天没有雾霾。结合语境可知填副词only，仅仅，只有。
【小题4】联系下文，可知此处指的是看起来像雾和烟。结合语境可知本句描述的是客观性事实，故用一般现在时态。主语that表达抽象含义，故谓语动词用单数形式，填looks，看起来。
【小题5】联系下文，可知此处指的是开汽车，动名词作主语表示抽象动作，联系下文可知填动名词driving，驾驶。
【小题6】句意：不好的空间对人们的健康有害。结合语境可知填形容词bad，坏的，不好的，作表语。
【小题7】联系下文，可知此处指的是温家宝做了他最后一次政府报告。结合语境可知本句描述的是过去发生的动作，故谓语动词用过去式，故填过去式动词made，使得，进行，制作。
【小题8】联系下文，可知此处指的是一个健康的，好的生活环境。故填形容词healthy / good，健康的/好的，作定语。