The invisible puzzle

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Across
  1. 1. A part of a house
  2. 3. Ashes
  3. 5. Gadget
  4. 7. A very complex math problem
  5. 11. customer service
  6. 14. Something you need to travel with
  7. 17. The weather, which had been sunny suddenly turned cold.
  8. 18. something you place on the table for clean up
  9. 19. When you are walking up a hill you are walking...
  10. 20. What is border connected to two states called
Down
  1. 2. What are you doing when your team tells you to fall back
  2. 4. Short
  3. 6. No name
  4. 8. Something keep buried and sealed
  5. 9. something that is not understood
  6. 10. Pain
  7. 12. Warmhearted
  8. 13. Interest
  9. 15. What is the room called in a business meeting
  10. 16. you walk into someone's