根据对话内容，从方框中选择恰当的选项补全对话。(每小题1分，共5分)
A: Hello, Sam. What’s your prediction about the future?
B: ____________________
A: I agree. Do you think robots can do the same things as humans?
B: No, robots can only help people do some things. _____________________
A: That’s right. ______________________
B: I think so. People are doing something for less pollution.
A: But I don’t think so.
B: Why?
A: _____________________
B: Do you think there will be more pollution?
A: Yes. We should stop people from doing that and keep our world clean.
B: ______________________ We must try our best to save our environment.

A. Because more and more people are building factories. B. Do you think there will be less pollution in the future? C. I think robots will be in every family in 50 years. D. I agree with you. E. But people will have more free time because of robots.