final YI3

FC or FP: " 6 billion people live in the world today, but 200 years from now, that number (grow) to 20 or 30 billion!"

FC or FP: 'So where will we all live? Many people (LIVE) in huge cities with populations of 30 or 50 million people.

FC or FP:"By then, some people (BUILD) houses on or under - the water too.

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