Plural:Do you add [s] or [es]?

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Across
  1. 2. volcano
  2. 4. dog
  3. 6. radio
  4. 8. brush
  5. 10. box
  6. 12. elephant
  7. 13. smile
  8. 15. tomato
  9. 16. dish
Down
  1. 1. kangaroo
  2. 3. dress
  3. 5. church
  4. 7. table
  5. 9. fox
  6. 11. sandwich
  7. 14. zoo