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No offense That Guy, but you just failed. First off, there are more than two countries in Asia. Second off, 7 billion minus 2.5 billion is equal to 4.5 billion, not 5.5. That said, I'm on to my predictions. It's tough, since many of these seem like trick questions.

1. Greece

2. Israel

3. China. Russia's population is decreasing, while China's is going up by many millions a year

4. Asia

5. United States, although I'm not sure what constitutes an internet user