Can you select the correct word from your spelling list?

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Across
  1. 4. the inverse to multiplication
  2. 6. acid on your teeth causes this
  3. 7. to have taken over somewhere
  4. 8. puzzled or unsure
Down
  1. 1. I think I will watch a Cbeebies on this
  2. 2. a crash
  3. 3. a loud bang
  4. 5. to practise over and over