TRANSPORTATION

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Across
  1. 3. 2 wheels and fast
  2. 6. go or move
  3. 7. in the sky
  4. 8. 4 wheels and big
Down
  1. 1. 2 wheels and slow
  2. 2. very very long
  3. 4. 4 wheels and not big
  4. 5. in the water