The Chinese once used about 3, 000, 000, 000 plastic shopping bags (1) , and they have caused pollution of the (2) . The bags have become a main cause of plastic (3) because they are not easy to break and people throw them away (4) . So the Chinese people are encouraged to bring their own bags for (5) . The Chinese once used about 3, 000, 000, 000 plastic shopping bags (1) , and they have caused pollution of the (2) . The bags have become a main cause of plastic (3) because they are not easy to break and people throw them away (4) . So the Chinese people are encouraged to bring their own bags for (5) .