-Cial, -tial words

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Across
  1. 4. Helpful, good for you
  2. 6. First, beginning
  3. 9. Extremely important
  4. 10. Secret, private
  5. 11. Authorized, formal
  6. 12. Incomplete, not whole
Down
  1. 1. Unique, out of the ordinary
  2. 2. Possible, capable of happening
  3. 3. Absolutely necessary
  4. 5. Related to business or trade
  5. 7. Not real, man-made
  6. 8. Relating to people or community