collective nouns

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Across
  1. 2. a ________ of wolves
  2. 5. a _______ of keys
  3. 8. a _______ of owls
  4. 9. a _______ of lions
  5. 10. a _______ of experts
  6. 11. a _______ of ground rules
  7. 12. a ________ of geese
  8. 13. a _______ of kangaroos
Down
  1. 1. a _______ of sheep
  2. 3. a ______ of stars
  3. 4. a _______ of singers
  4. 6. a ________ of crows
  5. 7. a _______ of robbers
  6. 9. a _______ of rubbish
  7. 11. a _______ of locusts