Mary: Hello, Tom.
Tom: Hi, Mary. What will our world be like in the year 2050?
Mary: I think lots of people will live"and"work under the sea.
Tom: Why do you think that?
Mary: Because the land"is becoming more"and"more polluted, we have to move to the sea.
Tom: Oh, I disagree with you. We can’t live without air.
Mary:"And"there will be big towns, factories"and"farms under the sea, too.
Tom: I can’t believe it. That’s too funny.
Mary: If we live under the sea, we will live like a fish.
Tom: It sounds impossible.