crowd - a large group of people in one place, pollution - damage caused to water, air by harmful substances or waste, graffiti - illegal writing or pictures painted on walls and public places, green spaces - areas of grass, trees or other plants in a town or city, power cut - a situation when the supply of electricity suddenly stops, traffic jam - a line of cars, trucks that are moving slowly or not moving at all, rush hour - the time when a lot of people are travelling to or from work and so roads and trains are very busy, rubbish - things that you throw away because you do not want them, public transport - a system of vehicles such as buses and trains which operate at the regular times and that the public use, recycling - the process of changing the materials into reusable things,

city problems

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