ADOREYOU

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Across
  1. 1. ...Are red, Violets are blue...
  2. 6. Star system, the cosmos and beyond.
  3. 7. One ... a day, keeps the doctor away.
  4. 8. Man's best friend.
Down
  1. 2. Salty water. Covers 71% of Earth.
  2. 3. Biggest animal.
  3. 4. Three, two, ... !
  4. 5. What color are sunflowers?