A Dog and a Cat's Spelling Crossword

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Across
  1. 2. A train that travels under the ground.
  2. 5. To interact with someone.
  3. 7. A very big shop.
  4. 8. A very popular person.
  5. 9. Between different countries.
Down
  1. 1. A small title under a big title.
  2. 3. Things like ghosts and monsters.
  3. 4. To sign your name to get something.
  4. 6. A machine that works underwater.
  5. 10. Between different cities.