1. robot 2. won’t 3. they’ll 4. paper 5. use 6. less 7. fewer 8. pollution 9. tree 10. she’ll 11. building 12. astronaut 13. rocket 14. space 15. space station 16. fly 17. took 18. moon 19. I’ll 20. fall 21. fell 22. alone 23. ..。
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