Write the nouns in plural

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Across
  1. 3. tooth
  2. 4. person
  3. 7. louse
  4. 9. calf
  5. 12. scissors
  6. 13. watch
  7. 15. potato
  8. 16. hero
  9. 17. mosquito
  10. 20. fireman
Down
  1. 1. foot
  2. 2. goose
  3. 5. leaf
  4. 6. crisis
  5. 8. criterion
  6. 10. analysis
  7. 11. echo
  8. 14. bus
  9. 18. ox
  10. 19. deer