DEBIDO A
| A1 |
Most of the air pollution takes place because of the burning of fossil fuels.
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| A2 |
Most of the air pollution takes place as a consequence of the burning of fossil fuels.
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| B1 |
Most of the air pollution takes place due to the burning of fossil fuels.
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| B2 |
Most of the air pollution takes place owing to the burning of fossil fuels.
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| C1 |
Most of the air pollution takes place in the event of / through / following the burning of fossil fuels.
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| C2 |
Most of the air pollution takes place by virtue of / on account of / on the grounds of the burning of fossil fuels.
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