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If tourists ______ rubbish in the river, the water would be cleaner.

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My mom always helps me to keep those plants alive. She definitely has green fingers.

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Bring a raincoat with you ______ it rains.

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If we banned plastic, what ______?

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Recycling provides a method of reducing the amount of waste materials that gets to the landfills – thus ______ it less probable for environmental pollution to take place.

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The coastal waters here have a complex ______ which includes thousands of plant and animal species.

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