k: ch

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Across
  1. 3. substances, sometimes poisonous
  2. 5. a sound repeated after the sound has stopped
  3. 6. a continuous pain
  4. 7. disorganisation and confusion
Down
  1. 1. a large scale plan
  2. 2. machinery & equipment developed from science
  3. 4. the part of a song that is repeated
  4. 7. a group of singers