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Here are the answers: 10. B. Deforestation 11. A. educational 12. A. weather 13. B. damages 14. D. emission 15. C. solutions Here are the answers with suitable prepositions: 1. You should start with small actions before coming up **with** big ideas that need a lot of effort or money to succeed. 2. My teacher guided me to do some research **on** environmental protection. 3. Biodiversity is important because plants and animals depend **on** each other to survive. 4. Countries need to work together to deal **with** global issues. 5. Scientists said that the burning of coal leads **to** air pollution. Here are the corrections for each question: 1. When these harmless gases combine with the water in the air, they come down as rain A B or snow, which can damage all forms of life. C D The answer is C, "or snow, which can damage" should be "resulting in damage" or simply "and damage". However, since 'snow' is not the main point and there is a comma after 'snow', the answer is D. 2. The imbalance of the ecosystem can cause to the disappearance of living. A B C D The answer is B, 'to' should be 'the' for the correct phrase to be "can cause the disappearance". 3. Phong said he handed in the project yesterday. A B C D The answer is none. However, if the sentence is in present context and the project hasn't been mentioned before, the answer would be C, and "the project" should be "his project". 4. Pollution can have serious effects for the balance of the ecosystem. A B C D The answer is B, 'for' should be 'on' for the correct phrase to be "can have serious effects on". 5. Nam believes that illegal hunting can be preventing by banning wildlife trade. A B C D The answer is C, 'preventing' should be 'prevented' for the correct phrase to be "can be prevented". D