Who did it?

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Across
  1. 3. Who invented the turtle boat?
  2. 5. Who built the tower in Paris?
  3. 7. Who wrote Romeo and Juliet?
  4. 8. Who invented Hangeul?
Down
  1. 1. Who invented the airplane?
  2. 2. Who is on the 50,000won money?
  3. 4. Who sang "I am"
  4. 6. Who made the water clock?