Singular and Plural

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Across
  1. 6. city
  2. 7. dish
  3. 9. sandwich
  4. 10. beach
  5. 13. potato
  6. 14. fish
  7. 18. ring
  8. 19. child
  9. 20. foot
  10. 21. person
Down
  1. 1. tomato
  2. 2. woman
  3. 3. brush
  4. 4. wife
  5. 5. tooth
  6. 7. dress
  7. 8. river
  8. 11. cat
  9. 12. baby
  10. 15. house
  11. 16. mouse
  12. 17. sheep