a

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Across
  1. 2. likes to chase mice
  2. 5. they are the first 7 letters of the alphabet
  3. 7. is pretty big
  4. 8. they can fly
Down
  1. 1. is what we are all made of
  2. 3. is a liquid we need to survive
  3. 4. it is a 3d round shape
  4. 6. Man's best friend