6. B. went 7. A. reduce 8. B. comedian 9. C. sporty 10. A. outdoor 11. C. stand 12. D. mine 13. C. What 14. D. reduce 15. B. will be 16. A. take care 1. Why do we write about the three Rs? 2. Reusable bags are more expensive than plastic bags. 3. Don't forget to turn off the tap when brushing your teeth. 4. Nam is the tallest person in my class. 5. We might go to the Moon for our summer holidays in 2050. 6. We take part in a lot of outdoor activities in summer. 7. She is interested in watching television. 8. If we plant more trees, the air will be fresher. 9. What a beautiful house! 10. My grandmother is the oldest person in my family. 11. In my future house, there will be many robots to do housework. 12. If you work harder, you will pass the exam.