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- 24 He __________ the environment for over ten years. (study)
- 25 We __________ hard to build nesting boxes. (work)
- 26 It __________ for two days. (rain)
- 27 He __________ money to Greenpeace for a long time. (donate)
- 28 The government __________ to reduce pollution for years. (try)
- 29 I __________ to clean out ponds for a year now! (volunteer)
- 30. She says we should save water when A. washing cars B. cleaning clothes C. taking a bath
- 31. One more way to save water is A. not to waste it washing dishes B. not to use hot water C. not to water plants
- 32. The girl's second suggestion is about A. separating different types of garbage B. putting trash into the bin C. having a family clean-up day
- 33. By recycling paper, we can A. protect the forests B. avoid paper waste C. save money
- 34. What does the girl do once a month? A. She cleans a neighborhood park. B. She collects old metal. C. She visits the recycling centre.
