Tarea de Vocabulario #4

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Across
  1. 2. transformation
  2. 5. to vote
  3. 6. complex
  4. 7. to develop
  5. 9. to fly
  6. 11. responsible
  7. 13. to keep informed
  8. 15. future
  9. 18. to become extinct
  10. 19. to appreciate
Down
  1. 1. invention
  2. 3. to replace
  3. 4. to value
  4. 8. to threaten
  5. 10. innovation
  6. 12. to improve
  7. 14. to breathe
  8. 16. to reuse
  9. 17. research