Singular and Plural

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Across
  1. 2. singular form of foxes
  2. 3. singular form of brushes
  3. 5. plural form of paper
  4. 8. plural form of box
  5. 9. singular form of watches
Down
  1. 1. plural form of book
  2. 4. plural form of ruler
  3. 5. plural form of pencil
  4. 6. singular form of stories
  5. 7. singular form of planets