Write the nouns in plural

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Across
  1. 4. calves
  2. 6. heroes
  3. 7. feet
  4. 8. watches
  5. 10. analyses
  6. 12. man
  7. 14. crises
  8. 17. deer
  9. 18. mosquitoes
  10. 19. potatoes
  11. 21. people
Down
  1. 1. leaves
  2. 2. echoes
  3. 3. teeth
  4. 5. firemen
  5. 9. criteria
  6. 11. lice
  7. 13. buses
  8. 15. scissors
  9. 16. geese
  10. 20. oxen