Abstract nouns

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Across
  1. 2. to be grateful
  2. 4. to protect
  3. 5. to conserve
  4. 6. to be ambitious
  5. 8. to preserve
  6. 9. to feel sorry
Down
  1. 1. to be determined
  2. 3. to be extinct
  3. 7. to be generous
  4. 8. to pollute