6．
从方框中选出合适的句子，填在对话的空缺处
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A. recycle B. protect C. when D. if E. difficult F. easy
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A: Hi, Sue, would you like to help the environment?
B: I'd love to, but I don't know what I can do.
A: First, you can start by turning off the lights.
B: Yes, that's . What's the next?
A: Second, you can ride a bike. Don't take a bus or a taxi you don't have to.
B: That will save money, too. What else?
A: Third, try to paper that is used by people around you.
B: Mm, that's a good idea!
A: And fourth, take your own bag you go shopping. Don't use plastic bags.
B: OK. My parents do most of the shopping. I'll tell them.
