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Rain becomes acid when power stations, factories, and cars 1. (are emitting, emit, emitted) their toxic fumes into the atmosphere. The polluted air mixes 2. (with, to, by) water, oxygen, and other chemicals to form acids. These then combine with water and other materials into clouds before falling 3. (on, to, down) the ground. Winds can blow 4. (polluting, pollution, polluted) clouds over long distances and across borders making acid rain a problem for everyone and not just those who live close 5. (by, to, near) these sources.

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