CHINA'S GRAND CANAL

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Across
  1. 2. : chief, primary
  2. 5. : straight
  3. 6. : ruler
  4. 7. : black fuel
  5. 8. : allowed, given, admitted.
Down
  1. 1. : distinct
  2. 3. : essential
  3. 4. : trader
  4. 6. : keen, enthusiastic