Insert prepositions, read & translate the sentences:
1. Air is especially polluted … busy intersections.
2. People should use fuels that are low … pollutants.
3. The problem with air pollution can be solved … 10 years.
4. London is known … its smog.
5. The air … big cities is noticeably polluted.
6. Sunlight acts … some harmful substances, so they undergo change …composition.
7. Air pollution in cities has a serious effect … elderly people, children and people who suffer … respiratory diseases.

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