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What is the main _____ of visual  pollution? – Because there are too many advertising billboards.

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Water pollution can put negative _________ on our health.

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

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

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

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The soil becomes ________ because of the use of so many pesticides and fertilizers.  

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Factories need to stop dumping industrial ______ into the lakes and rivers immediately.