accident, first, main, them, keep, pollute, settler, harm, appear, balance, although, people

Nowadays, the hazy (雾霾的) weather often         in our country. It has not only affected the public transportation but also done great        to people’s health. Terrible        happen every now and then. Some freeways are shut down because of the low visibility (能见度). In Nanjing, schools had to close because of the hazy weather last December.
Obviously, air pollution is the (        cause that has resulted in (导致) the terrible weather. People don’t pay much attention to the environment, so the        between nature and human beings is lost.
People have started to consider how to protect       on hazy days. They try to avoid outdoor activities and wear expensive masks to        away from haze while going out. But actually, no one can really keep away from it        they wear masks or stay inside. Haze is everywhere around the city.
Haze is a warning. It warns us to take action to make our Earth a better place. If Earth is too       for us to live on, what should we do?  Maybe we have to be        on Mars.