Here are the best options to complete the sentences:

16. Plants and animals cannot grow and live well in **B. polluted** areas.

17. There are factories that **D. recycle** broken glass and make the water polluted.

18. Turning off the air conditioner ten minutes before leaving saves a lot of **B. electricity**.

19. If you **A. drink** enough water, you won't be thirsty.

20. Barry loves running, **C. and** he is also a member of our school's running club.

21. We should reduce the use of plastic **C. so** that we can save the environment.

22. She won't pass exam if she **B. doesn't study** hard.

23. My father loves traveling, **A. but** he never had a chance to go abroad.

24. We won't complete the task on time unless we **B. keep** working hard.

25. What does the sign mean? **B. You mustn't cut down trees in this area.**

26. I always enjoy **C. talking** to my grandfather. He always tells me great stories.

27. Jane prefers **C. to play** music than to listen to it.

28. How much time do you spend **A. on** leisure activities?

29. Huong is **D. addicted to** Social media. She spends lots of time on Facebook and Instagram.

30. "My favourite leisure activity is people watching." " **D. Sure. It's very entertaining.**"

Feel free to ask if you have any further questions!