Problem Puzzler

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Across
  1. 1. It's the answer
  2. 4. A chance encounter
  3. 5. Only one of these exists
  4. 7. Angry exchange in the singular
  5. 10. A number of possible futures
  6. 11. To trial without knowing the outcome
Down
  1. 2. More than one question mark
  2. 3. Variety is the spice of life
  3. 6. Unexpected appearance
  4. 7. Not just complicated
  5. 8. Beyond evil
  6. 9. Linked so that change in one part effects all the others
  7. 12. Knitting to order or repeated occurrences