Simple

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Across
  1. 4. according to what could possibly exist,happen,or be true
  2. 5. a belief that something is true,even though there is no proof
  3. 6. something that you are born with
  4. 9. the ability to do something
  5. 11. to choose
  6. 12. with possessing something that is needed for a particular purpose
Down
  1. 1. with in agreement with
  2. 2. a length of time
  3. 3. correctly
  4. 7. to help someone or something develop and be successful
  5. 8. a person you work with
  6. 10. not part of the usual work or studies at a school or college