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Here are the answers with the words filled in: 1. Solar panels are expensive to buy, but they save a lot of money by taking energy from the sun. 2. He works at a coal power plant. It produces the electricity for Springfield Town. 3. The good thing about renewable energy like solar power is that it never runs out. 4. Non-renewable energy sources like coal causes a lot of pollution which is bad for the environment. 5. My cooker uses natural gas. We have to replace the bottles twice a year. 6. Non-renewable sources like coal and oil cannot last forever. 7. Nuclear is a very powerful energy source, but it can be very dangerous. 8. He repairs the wind turbines when they break down and stop turning. Here are the answers: 9. has to 10. don't have to 11. have to 12. has to 13. don't have to 14. doesn't have to Here are the unscrambled sentences: 1. My parents are so delighted because I passed all my exams. 2. I'm disappointed because I didn't come top of the class. 3. I'm really surprised because I passed my physics test. 4. He's very annoyed because he failed his math test. 5. The teacher was very pleased with my class presentation. Here are the completed sentences using possessive pronouns: 1. That big orange backpack is mine. 2. Look! That's mine. 3. Is that John and Matt's? 4. Is that yours? 5. It's mine. 6. Is that his? 7. His is bigger than hers. (The next sentence doesn't have a blank to fill, but the conversation continues to find Tom's backpack.)