1. Polluted water can _______________ do harm to people’s health. (direct) 2. We should keep our environment ____________. (pollute) 3. According to the weather forecast, it will be _____________ tomorrow. (sun) 4. The machine will go into full _______________ in January 2022. (produce) 5. How many planets are there in our ________ system? (sun) 6. Energy-saving bulbs help _______________ save lots of money. (consume) 7. They’ve measured the car’s fuel _______________ (consume) 8. Remember to use energy more _______________ (efficiency) 9. ______________ are encouraged to complain about faulty goods. (consumption) 10. Energy _____________ includes searching for alternative fuels. (conserve) 11. They greeted their visitors with formal ___________. (polite) 12. Mary has very ____________ offered to help out with the food for the party. (kind) 13. As the world’s energy resources are limited, we must _______________ them. (conservation) 14. She _____________ refused his invitation. (polite) 15. “To_____________” means to remove trees or forests from a place. (forest) 16. Sulphur dioxide is one of several __________that are released into the atmosphere by coal-fired power stations. (pollute) 17. They wore a charm as a ______________ against evil spirits. (protect) 18. He is the president of an ______________ club in our city. (environment) 19. They voted in favor of the ____________ of smoking in public areas. (prohibit) 20. Jogging is a very ___________ form of exercise. (energy)