81. Why the Sky Is Brown









 
  1. battle

  2. courteous

  3. drift

  4. emission

  5. foul

  6. gasoline

  7. gross

  8. inefficiently

  9. mechanic

  10. mention

  11. pipe

  12. polluter

  13. pollution

  14. purify

  15. recommend

  16. regular

  17. relieve

  18. sensor

  19. specialize

  20. stick

  21. tail

  22. vehicle


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