Mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions.

Trees not only bring nature to urban areas, but they also help clean the air by absorbing pollutants, ______oxygen, ______water, and growing food.

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Individually wrapped candy or chocolate causes a lot of trash, __________fruits and vegetables are healthier and mean less waste.

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Sometimes it’s better not to buy something new, and buy ________one instead.

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Fossil fuels which are non-renewable pollute the air and cause air _______.

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If wastes are thrown ____________, they can cause pollution in water, land and air.

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Air pollution is such a serious ________that it has been a direct factor in the ______of millions of people each year.

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You should use electric fans instead of air conditioners _______they don’t emit dangerous gases.