Work!!

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Across
  1. 5. connect in thought or meaning
  2. 6. to think it will happen
  3. 8. to guarantee or make certain of
  4. 9. "might actually happen"
  5. 10. to tell apart
Down
  1. 1. not required
  2. 2. "very important"
  3. 3. believable
  4. 4. to lessen in intensity
  5. 7. an explanation