【原创】Zheng Xiyu works at an office in Beijing's Central Business District. Every day, it takes her roughly 40 minutes to go to work by bus. But she is thinking of _     (switch) to a different way of transport-a bicycle. She's also adapting to a vegetable diet as Iivestock can make many contributions       today's most serious environmental problems. A recent survey shows that 78% of all the 17,000 people        (question) have developed environmentally_      (friend) habits in their daily lives. They are doing things, such as taking reusable shopping bags to the store and setting the air conditioner at          temperature above 26 C in summer. On many popular social networking         (website), people are advocating a low-carbon lifestyle.Their tips include using the stairs and public transport more frequently      _ using elevators and cars. They hope this lifestyle will become more than just a trend within certain groups. As the most populous nation on the planet with the world's          (fast) growing economy, China has become the second biggest emitter(排放者) of greenhouse gases. The recent extreme weather in the southern regions         (reflect) a serious environmental challenge.Experts say there is no time           (delay) with the effort to reduce carbon emissions.