Choose the word which is opposite in meaning to the underlined word in the following sentence.

These toxic chemicals will contaminate the groundwater and make it unsafe for drinking.

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

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Bring a raincoat with you ______ it rains.

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

Choose the phrase which is closest in meaning to the underlined phrase in the following sentence.

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

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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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If we banned plastic, what ______?

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