The digraph tt making the t sound as in letter

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Across
  1. 4. catching some one's interest
  2. 5. a bit like a phoneme
  3. 7. something that powers up things like torches
  4. 8. something that repeats itself more than once
  5. 10. a device to control the flow of fuel to an engine
  6. 11. breaking up a word into a beat or a rhythm
  7. 12. to make an effort to do something
  8. 13. a sound
Down
  1. 1. 1 sound created by 4 letters
  2. 2. moving to a new area
  3. 3. an object to get people’s interest
  4. 6. behaviour
  5. 9. writing in the past