per- prefix (through, across)

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Across
  1. 3. – through + able → able to let things pass through
  2. 5. – through + send + state → the act of allowing something
  3. 7. – through + go → spreading widely through something
  4. 8. – through + continue + state → continuing even when something is hard
Down
  1. 1. – through + spread → to spread through something
  2. 2. – through + shape → to make holes in something
  3. 4. – through + stay → lasting a long time or forever
  4. 5. – through → to die or be destroyed
  5. 6. – through + year → lasting for many years
  6. 7. – through + allow → to let something happen