Ti,Si,Ci

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Across
  1. 3. Very important
  2. 5. To see
  3. 7. To help understand something difficult
  4. 8. Large house
Down
  1. 1. Device for receiving broadcast signals and converting them into sound and pictures
  2. 2. Gives you a meaning of a word
  3. 4. An ad on TV
  4. 6. A form of punishment used in schools