Making plurals: -s, -es, or -ies ?

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Across
  1. 4. watch
  2. 7. donkey
  3. 9. brush
  4. 10. bunch
  5. 11. story
  6. 13. apple
  7. 14. cherry
  8. 15. dress
Down
  1. 1. bus
  2. 2. cat
  3. 3. chimney
  4. 5. class
  5. 6. box
  6. 8. elbow
  7. 12. idea