用方框中所给单词的适当形式填空，使对话通顺、正确。每词仅用一次（每空一词）。
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Marie：Roy and Carla, what are your ideas for solving these pollution problems？
Roy：To cut down air pollution，we should take the bus or subway instead of ____
Carla：Yeah, or ride a bike. There are other advantages of bike riding. It's good for health and it doesn't____ much！
Marie：Great ideas！What about waste pollution?
Carla：Mmm, I thank simple things like bringing a bag to go shopping can help. I started doing that a year ago.
Roy：Me，too. Also I never take wooden chopsticks or plastic____ when I buy takeaway food. I use the ones at home．
Carla：And remember to throw rubbish in the bins and keep____ places clean and beautiful for everyone·
Marie：So together, our actions can make a____ and lead to a better future！
