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Many cities are growing very fast because of ____ — more people are moving from villages to cities.
urbanisation
The air in big cities can be very dirty because of traffic and factory ____.
Pollution
Good public transport, roads, and electricity are part of a city’s ____.
Infrastructure
If too many people live in one small area, the population ____ becomes very high.
Density
Parks, schools, shops, and hospitals are important ____ in a city.
Amenities
