Mr Short's crossword of fun.

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Across
  1. 2. The caped crusader
  2. 4. A structure for getting over a gap
  3. 5. Mr Short's secret identity
  4. 7. A chemistry teacher at WGS who doesn't have much hair.
Down
  1. 1. A product of combustion other than water
  2. 3. Mr Short's favourite colour
  3. 6. An alloy made mainly of iron