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1. Let's not bury chemicals. (Answer: A) 2. The firefighters immediately came to rescue the koala until they saw it was not in the fire. (Answer: C) 3. Please wait here when the volunteers are picking up rubbish along the river. (Answer: B) 4. If people pay a few more attentions to the environment, the Earth will be cleaner. (Answer: C) 5. (Statement seems correct, no correction needed.) Here are the completed sentences using conditional sentences type 1: 1. If the air in a city gets very polluted, it can make people's eyes burn. 2. If we dump all sorts of chemicals into rivers, we will not be able to swim in them in the future. 3. Many wildlife habitats will be destroyed if people keep polluting the environment. 4. If we all use public transport more, we will help reduce air pollution. 5. If we do not stop over-fishing the oceans, many species will become extinct. 6. If everyone recycles paper, metal, and glass, we will not produce so much rubbish. 7. We will have dirty seafood if we dump rubbish into the sea. 8. If global warming continues, temperatures will rise even higher. 9. If light pollution keeps growing, you will not be able to see even the Big Dipper at night. 10. We will threaten our own existence if we do not cut down the waste rapidly. Here are the completed sentences with the correct form of the given words: 1. It's evidence that this ocean is clean and environmentally friendly. (Instead of "pollute", we use the word "friendly" to describe a positive relationship with the environment.) However, if we have to use "pollute", it will be: It's evidence that this ocean is clean and does not pollute the environment. Or better yet: It's evidence that this ocean is clean and unpolluted. 2. World Wide Fund is a famous environmental organisation. 3. This area is a part of a wildlife conservation programme. 5. Sea turtles and dugongs are some endangered species living in Con Dao.