Silent letters

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Across
  1. 3. a serious expression
  2. 4. protection from something
  3. 6. to make conversation
  4. 7. a person who receives something
  5. 9. a background
Down
  1. 1. medieval knights upheld a code
  2. 2. a part of your finger
  3. 4. something that you see dogs doing to bones
  4. 5. broken pieces of something
  5. 8. to owe someone something