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20. The teacher suggested that students _____ more English books to improve their reading skills.
A. to read B. reading C. read D. reads

21. She was late for the meeting _____ the heavy traffic in the city center.
A. although B. so C. since D. because of

22. The robot vacuum is designed to _____ up dust, dirt, and pet hair efficiently.
A. orbit B. suck C. push D. preserve

23. The Amazon rainforest is often called the "lungs of the Earth" because it _____ a large amount of the world’s oxygen.
A. destroys B. produces C. wastes D. reduces

24. __________ is a threat to wildlife habitats around the world.
A. deforestation B. forest C. deforest D. forestry

25. When animals rely on each other for survival, they create a relationship known as a(n) __________.
A. ecosystem B. food chain C. environment D. structure

26. The __________ helps keep species and plants safe and prevent their extinction.
A. climate change B. habitat loss C. nature reserve D. global warming

27. Teachers raise awareness ___ the food chain, so students understand the importance of every species.
A. at B. on C. with D. about

28. The Earth, ________ atmosphere protects it from harmful solar radiation, is the only known planet with life.
A. which B. who C. that D. whose

29. Environmental conservation, ________ is a global priority, helps to protect the planet’s biodiversity.
A. which B. where C. that D. who

30. Linda: “How would you feel about helping out at the recycling event this weekend?”
Sophia: __________________________
A. I’d be happy to help! When does it start? B. Hi Linda, I’m feeling pretty well. Thank you!
C. No, I don’t need help. Thank you so much. D. I think it starts next week or a week after that.