Plural Endings.

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Across
  1. 3. brush
  2. 4. wolf
  3. 6. knife
  4. 9. puppy
  5. 10. monkey
  6. 11. tooth
Down
  1. 1. wish
  2. 2. child
  3. 5. city
  4. 7. person
  5. 8. fly
  6. 10. mouse