根据下面对话中的情景，在每个空白处填入适当的语句，使对话恢复完整。
A: Hi, Mary, I watched a TV show just now about the future.
B: Sounds cool. ____________1____________________?
A: Well, there will be more computers than books.
B:__________________2______________？
A: No, students will study on computers at home. Computers will be much cheaper.
B:___________________3______________________?
A: No, people won’t use money. Everything will be free in the future.
B: This great._________4_____________________?
A: The environment will be in great danger. We will live on the space stations.
B: But, I want to live on the earth.______5_____________________?
A: I think we can use less water and plant more trees.