Digraph ch

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Across
  1. 1. a deep crack in the earth
  2. 3. a repeated sound caused by reflection of sound waves
  3. 4. a continuous dull pain
  4. 7. special features of something or someone
  5. 9. a person studying at an advanced level
Down
  1. 2. a heavy metal object for mooring a ship
  2. 5. a trained cook
  3. 6. a skilled worker who repairs and maintains machines
  4. 7. a group of singers
  5. 8. a place for learning