（B)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）。

cost   different    drive   public   fork

 
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 think 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 keepplaces clean and beautiful for Everyone
Marie：So together，our actions can make aand lead to a better future！