Singular, Plural

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Across
  1. 4. a tooth
  2. 5. a cat
  3. 6. a man
  4. 7. a fly
  5. 9. a child
  6. 13. a policeman
  7. 14. a dog
Down
  1. 1. a woman
  2. 2. a potato
  3. 3. a sheep
  4. 7. a fish
  5. 8. a knife
  6. 10. a boy
  7. 11. a mouse
  8. 12. a foot