It is thought that one billion people I the world,________is half the word’s workers, earn their living by farming.

Since the recent river pollution in Shanxi Province , people ____ more and more attention to the water quality

_____ small, the company has about 1000 buyers in over 30 countries

person lives too many hours a day in thedigital universe, that is when he or she _____ something

There________ a lot of rubbish there in the past. But now it has turned into a clean place.