Ambiguous Vowels - ough, oi, /u/

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Across
  1. 2. a piece of metal used as money
  2. 5. past tense of 'bring'
  3. 7. past tense of 'buy'
  4. 10. having a coarse or uneven surface
  5. 12. to suddenly expel air from the lungs with a harsh noise
  6. 14. to contact something with your hand or finger
  7. 15. not one, not any
  8. 16. at one time in the past or a single time
  9. 18. the part that faces forward
  10. 20. worn on the hand for warmth
  11. 21. strong and durable
Down
  1. 1. a sharp end of something
  2. 3. a sound of any kind
  3. 4. the place where two things meet (ex. knee or elbow)
  4. 6. past tense of 'fight'
  5. 8. the sounds uttered through the mouth of people
  6. 9. to move by a force from behind
  7. 11. past tense of 'think'
  8. 13. to become united or associated with someone else
  9. 17. having more than one option
  10. 19. form of the word 'do' and used with he, she, or it