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I think in the future cities will be more crowded and the traffic will get ________.

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Rio de Janeiro is a very culturally _____________city.

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Diseases ___________more quickly in overcrowded areas.

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In Manila, over 30% of the population lives in _____________.

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Children in the slums have more diseases than ___________in wealthy areas.

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People move to big cities for a better ____________.

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When ____________people live in a small place, life can be very difficult.

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Overpopulation problems ________both the rich and the poor.