Fun with Nouns: Singular and Plural Crossword Puzzle

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Across
  1. 2. The plural form of "book."
  2. 4. The plural form of "girl."
  3. 6. More than one person, place, or thing.
  4. 7. The plural form of "mouse."
  5. 8. The plural form of "cat."
Down
  1. 1. A word for a single dog.
  2. 2. A word for a single boy.
  3. 3. A word for one person, place, or thing.
  4. 5. The opposite of singular.
  5. 6. A word for one pen.