Fun crossword challenge

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Across
  1. 2. Musical Instrument with Keys
  2. 3. Citrus Fruit
  3. 5. Essential Human Organ
  4. 7. Greek God of Thunder
  5. 8. Capital of Japan:
  6. 10. Famous American President
  7. 11. Sweet Frozen Dessert
  8. 14. Italian Pasta Dish
  9. 17. Mythical Creature with One Horn
  10. 18. Dog Breed
  11. 19. Car Small, Fast Car
Down
  1. 1. Long Serpentine Sea Creature
  2. 4. Largest South American Country
  3. 6. Element with the Symbol "O"
  4. 9. Olympic Sport with a Net
  5. 12. Capital of Spain
  6. 13. Warm Outerwear
  7. 14. Earth's Nearest Star
  8. 15. Insect Known for Pollination
  9. 16. Computer Input Device