Consonant alternation - Silent to Sounded

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Across
  1. 1. swiftness of motion
  2. 3. to speak harmful truths about
  3. 5. drives the body into motion
  4. 7. quick, swift, or rapid
  5. 8. to be chosen
  6. 9. very harmful or dangerous
  7. 10. to secure into place
  8. 11. a person's name, or a mark representing it
  9. 12. season after summer
  10. 13. to express an unfavourable or adverse opinion of
  11. 15. flexible
  12. 16. a token or indication
Down
  1. 1. to speed up
  2. 2. red, orange and yellow are -------- colours
  3. 3. to make wet
  4. 4. a branch
  5. 5. damp
  6. 6. the act of condemning
  7. 9. broad and energetic
  8. 14. to create