Find the Missing Words, Little Explorer!

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Across
  1. 1. Fluffy thing in the sky
  2. 3. A happy feeling
  3. 5. Animals that say meow
  4. 7. A road where people walk or drive
Down
  1. 1. A place where pets see a doctor
  2. 2. You open this to go inside a house
  3. 4. Something you read or listen to
  4. 6. Beating thing inside your chest