PREFIXES - PRE + SUB // SUF

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Across
  1. 5. letters fixed to the beginning of a word
  2. 6. before history
  3. 8. a title under the main heading.
  4. 9. to heat before
  5. 10. the school before primary
Down
  1. 1. to test before
  2. 2. no need to do anything under / after.
  3. 3. letters fixed under / after a word
  4. 4. a vessel under the sea
  5. 7. a way under or below ground
  6. 9. to see before