Jacob's puzzle

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Across
  1. 3. inexhaustible
  2. 4. implausible
  3. 5. argument
  4. 7. fortuitous
  5. 9. warble
Down
  1. 1. auditorium
  2. 2. gnawing
  3. 5. fraudulent
  4. 6. bulk
  5. 8. sauntered