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____ the seventh lunar month comes, Vietnamese people often celebrate Vu Lan festival (or Mother's day).

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________ pollution can directly cause hearing loss.

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Ships spill oil in oceans and rivers. This leads ________ the death of many aquatic animals and plants.

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Households pollute water sources by _______ waste into ponds, lakes, and rivers.

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To protect the environment, we should use more _______ sources of energy as wind and solar power.

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_______ are things that make the air, water, and soil unclean or contaminated.

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Water pollution can put negative _________ on our health.

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Water pollution has _______ many diseases for plants, animals and especially people.