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Here are the answers to the exercise: 6. various 7. land 8. negative 9. remote 10. aesthetics Here's the completed conversation: Tom: Can you do me a favor, Dad? Dad: Of course. What can I do for you? Tom: What's renewable energy, Dad? Dad: Coal and oil are fossil fuels. They take thousands of years to form. Tom: Why do we call them renewable energy? Dad: (laughs) You can't call them renewable energy, Tom. They're actually non-renewable energy. Tom: How about fossil fuels? Dad: Well, wind and solar power are renewable energy. Tom: Are fossil fuels renewable energy, Dad? Dad: No, I'm afraid not. They are non-renewable energy. Tom: Why do we call them non-renewables? Dad: Because they can't naturally refill themselves in a short amount of time. (The extra sentence is: "Because they can naturally refill themselves." This sentence was incorrectly used to describe fossil fuels and non-renewable energy. Renewable energy sources can naturally refill themselves, not fossil fuels.) Here are the combined sentences: 1. Wind energy is clean, and it is renewable, too. 2. Nuclear power is clean, but it is dangerous. 3. Energy from coal is cheap to build, but it is expensive to run. 4. Hydropower needs big rivers, but it is expensive to build. 5. Natural gas is cheap to build, but it creates some pollution. 6. Buses are cheap, but they are crowded. 7. Our town is big and modern, but it is noisy. 8. Nuclear power plants produce clean energy, but they are expensive to build. 9. Wind turbines create noise, and they need windy weather to work well. 10. Hydroelectric plants do not cause pollution, but they can affect the environment. Note: For sentence 10, I changed "not cause" to "do not cause" for grammatical correctness, and added "can" to the second clause for better sentence flow. Advantages of Electric cars and Gasoline cars, Disadvantages of Electric cars and Gasoline cars Advantages: - Electric cars: 66 use cleaner energy (+), quiet to run (+), 99 reduce pollution (+) - Gasoline cars: cheap to buy (+), faster to run (+), could travel far (+), take less time to fill up gas (+), easy to look for a gas station (+) Disadvantages: - Electric cars: expensive to buy (+), slower to run (x - this is actually not an advantage of electric cars but one of gasoline cars), hard to find a charging station (+), could not travel tar (+), take more time to charge (+) - Gasoline cars: cause pollution (+), pay for gas (+), noisy to run (+), use non-renewable energy (+) It appears that you've provided a text with errors. Here is the corrected version: 6. Electronic cars use cleaner energy, but they reduce pollution. Corrected sentence: Electronic cars use cleaner energy, and they reduce pollution. 7. (The original text seems to be jumbled and unclear. Here's a rewritten version based on common concerns about electric cars.) Electric cars are quiet to run, and they can travel a moderate distance. Although they are hot to buy, and it's easy to repair them. However, you have to pay for gasoline. Corrected and rewritten version: Electric cars are quiet to run and can travel a moderate distance. Although they are expensive to buy, they are easy to repair. However, note that electric cars do not use gasoline, so you would not have to pay for it. Please let me know if you'd like me to clarify or explain any part of the correction.