Vocab Puzzle

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Across
  1. 3. usual
  2. 5. by use of machines
  3. 7. person who makes sure things are working
  4. 9. better
  5. 10. something used without result
Down
  1. 1. hundreds of years of time
  2. 2. figured out
  3. 4. improvement
  4. 6. put in
  5. 8. argue