What can it be?

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Across
  1. 5. A popular term for police officer.
  2. 6. Self defense art.
  3. 7. The first living alarm clock.
  4. 9. A document prepared in a new language
  5. 11. Area to place a computers.
  6. 13. Used while studying.
  7. 15. Kitchen appliance.
Down
  1. 1. Exploding mountains.
  2. 2. Popular Italian dish.
  3. 3. A kind of boat.
  4. 4. A dead body.
  5. 7. A place to ice Skate.
  6. 8. Not being restricted.
  7. 10. A weapon use to injure or kill.
  8. 12. An invisible barrier.
  9. 14. Used to cover a window.