1. The ____ heat made it difficult to sleep at night. 2. After the heavy rain, the path became very ____. 3. Scientists warn that many species could ____ if we don't protect their habitats. 4. The government needs to ____ an idea to encourage people to use renewable energy. 5. The ____ devastated the small village at the bottom of the mountain. 6. He decided to ____ eating sweets for a month. 7. The ____ caused a severe famine in the region. 8. We need to ____ our planet for future generations. 9. The volcanic ____ caused the airport to close, so our flight couldn't take off. 10. The explorer risked frostbite on his fingers in the ____ temperatures. 11. Burning ____ releases carbon dioxide into the atmosphere. 12. The politician tried to persu____de the public that nuclear energy was safe. 13. It's tough to ____ working when you feel so tired. 14. Let's not ____ any longer; we need to book the venue for the party today.

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