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Crossword solution:

9 clues for "GASES":

  1. Vapors
  2. Argon arsine etc
  3. Certain elements.
  4. Dentists aids at times
  5. Fills 'er up
  6. Fumes.
  7. Mustard, laughing, etc.
  8. Neon, oxygen, etc.
  9. ___ up (fills the tank)