The Land I lost

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Across
  1. 5. drugs taken from a poppy
  2. 6. very large bovid
  3. 7. aquatic creature
  4. 8. city in Vietnam
  5. 9. activity of killing wild animals
  6. 10. animal that lives in fresh water
Down
  1. 1. Country in Asia
  2. 2. large poisonous snakes
  3. 3. to give into something
  4. 4. not held in position correctly