What's Your safewords?

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Across
  1. 2. Action of cleaning
  2. 5. Used in breathing
  3. 6. Used in laboratory
  4. 7. Walk to safety
  5. 9. Pressurised cannister
Down
  1. 1. Easily to get burnt
  2. 3. Type of fire
  3. 4. Sheet of extinguisher
  4. 8. Make hydrogen drinkable
  5. 10. To hold tightly