Plurals and Possessives

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Across
  1. 2. (singular) (informal, familiar) your
  2. 3. strawberries
  3. 5. keys
  4. 9. (singular) our
  5. 10. (formal, plural) your, his/her
  6. 12. (plural) my
  7. 14. fish
  8. 15. words
Down
  1. 1. letters
  2. 2. (singular, formal) your
  3. 4. they are
  4. 6. books
  5. 7. it is
  6. 8. (formal, singular) your, his/her
  7. 9. (plural) our
  8. 11. newspapers
  9. 12. (singular) my
  10. 13. apples