LICENSE TO THRILL

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Across
  1. 4. without thought
  2. 6. practical joke
  3. 8. swift action
  4. 9. person who pretends to be someone else for entertainment
Down
  1. 1. traveling between planets
  2. 2. outside of earth
  3. 3. an area that is sealed off
  4. 5. a room built for science
  5. 7. at the same time