根据对话内容，从方框中的六个选项中选出五个合适的句子补全对话。
Linda: Hello, 76F _A .
Peter: I’m reading a book about the people’s lives in the future.
Linda: Oh, it’s interesting. What will the people’s lives be in the future? 77D
Peter: Yes, I think so, but I hope not.
Linda:78B C
Peter: Because there won’t be enough food, fuel and room for too many people on the earth!
Linda: That’s true. 79_
Peter: It’s too hard. But maybe people will have on space stations (空间站) on the moon and grow vegetables (种植蔬菜)there.
Linda: 80_ . By the way, do you think everyone will speak the same language in the future?
Peter: I hope so. Then people in different countries will understand each other better.
A. Do you think there will be more people?
B. But maybe people will live on the moon in the future.
C. It’s a good idea
D. Why do you hope not?
E. Where are you going to do ?
F. what are you doing?
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解析：
【小题1】根据下文I’m reading a book 可知上文问的是你正在做什么，故选F。
【小题2】根据下文Yes, I think so, 可知上文是征求某种意见，故选A，你认为那儿会有更多人吗？
【小题3】根据下文Because ……，可知上文是提问某种原因，故选D，你为什么希望不？
【小题4】联系上下文可知选B，最符合逻辑。但是在将来人们可能会生活在月球上。
【小题5】联系上文and grow vegetables (种植蔬菜)there.描述可知选C，这是个好主意。