The Communist Party has made great progress in reducing China’s pollution, but     1     perfect storm of northern winds and an industrial rebound has created dangerously high levels of pollution countrywide.

Sandstorms used     2     (be) a regular occurrence in spring. In previous decades, each May saw at least two rounds of sandstorms, according to state-run Xinhua news agency. The     3     (frequent) and severity of sandstorms was partly due to drought,     4     (grow) population pressure and poor progress in revegetation,     5     caused rapid desertification of land in the north and northwest.     6    , sandstorms have since decreased dramatically. The annual number of sandstorm     7     (impact) days in Beijing fell from a peak of 26 in the 1950s to just three days after 2010, Xinhua reported.

Since 2000, the Chinese government     8    (invest) billions of dollars toward sandstorm prevention. Authorities have launched     9     (variety) reforestation and ecological projects, and installed satellites to monitor sandstorms and alert weather agencies     10     of time.

2 . Open an app at your smart phone and scan the code bar on the garbage can. When you throw garbage into the garbage can, it will show the weight of the garbage and the points you can get from doing so.     1     It will become more popular in the future. Yes, we are talking about the smart garbage can.

    2     The environmental problems have become constant headaches in the development of those cities. Encouraging garbage classification has become an effective way.

In some cities, a variety of multifunctional smart garbage cans are being put into use. In Beijing, for example, a smart garbage can is equipped with an LED screen, which not only shows national policies on garbage classification but also shows the correct steps for garbage sorting. It can also calculate the weight of the garbage and the accumulated points one can get. They can be traded for some articles of daily use.     3     Its body is actually a screen. It is equipped with some Internal sensors. When people throw garbage into it, the internal sensors can automatically tell the types of the garbage. Meanwhile, people can see how to deal with them.     4    

Garbage disposal is a small issue that involves everybody each day. However, it is also a big issue.    5     With smart garbage cans in our daily life, the idea of garbage sorting will become more established. Our dream of building a greener and more beautiful China will come true so long as we start to make small changes right now.

3 . In 1620, about half the USA was covered by forests. Today the forests have almost gone. A lot of good land has gone with them, leaving only sand. China doesn’t want to copy the USA’s example. We're planting more and more trees. We’ve built the “Great Green Wall” of trees across northern part of our country. The Great Green Wall is 7,000 kilometers long, and between 400 and 1,700 kilometers wide. It will stop the wind from blowing the earth away. It will stop the sand from moving towards the rich farmland in the south. More “Great Green Walls” are needed. Trees must be grown all over the world. Great Green Walls will make the world better.