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В скобках убираешь to и добавляешь окончания ing
1 Air, noise , water and air pollution are all major problems in our world today.
2 The exhaust fumes cars produce can cause serious health problems in big cities.
3 People who decide to go green often begin by recycling household waste like paper and glass.
4 Wind and solar power are alternative forms of energy.
5 Climate change is the long- tern diffrence in the weather of an area.
6 The more things we buy, the more waste we produce.