Which one doesn't belong?

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Across
  1. 4. sun, moon, stars
  2. 5. shorts, gloves, scarf
  3. 6. slide, swing, bed
  4. 11. bus, airplane, truck
  5. 13. carrot, apple, grapes
  6. 15. bear, eagle, tiger
  7. 16. plate, cup, mug
  8. 17. bird, bee, ladybug
  9. 19. dog, cat, elephant
Down
  1. 1. crayon, ruler, marker
  2. 2. table, chair, couch
  3. 3. canoe, broccoli, ship
  4. 7. dolphin, shark, dog
  5. 8. shoes, socks, hat
  6. 9. frige, bathtub, oven
  7. 10. rose, train, tulip
  8. 12. toothbrush, toilet, pillow
  9. 14. carrot, banana, broccoli
  10. 18. blanket, rock, pillow
  11. 20. pancakes, pizza, eggs