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His grandfather made him __________ hard when he was small

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Could you list some non-point source __________?

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I can’t hear your voice __________ I’m wearing an earplug

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Scientists has just come up __________ a solution to hearing loss.

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Do you know what is the cause __________ pollution?

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__________ water resulted in the death of many aquatic animals.

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If we dump a plastic into the ground, it __________ a long time to disappear.

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This picture __________ the contamination of ground water.

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My mother has to measure blood __________ every month.

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__________ pollution is the increase of temperature caused by human activity.

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Pollutions are harmful __________ human health.

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Have you ever heard about the __________ of radioactive pollution?

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 Parents should teach children not to __________ wastes on the road.

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What would you do if a factory in your neighborhood __________ untreated water into the river?

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 __________ pollution is harmful or annoying level of noise, as from vehicles, industry activities, etc.