the plural in English

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Across
  1. 1. cup
  2. 4. lady
  3. 6. city
  4. 7. day
  5. 9. potato
  6. 11. man
  7. 12. car
  8. 13. boy
  9. 14. wife
Down
  1. 2. sandwich
  2. 3. box
  3. 5. thief
  4. 6. child
  5. 8. woman
  6. 10. tomato