"Secret Garden" puzzle

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Across
  1. 4. Very angry
  2. 7. Say something quietly
  3. 9. Not the same as another
  4. 11. Something you don't tell other people
  5. 12. Get back from somewhere
  6. 13. Walk around
  7. 15. A low place of land between hills or mountains, with a river or stream
Down
  1. 1. Unhappiness
  2. 2. Trust somebody
  3. 3. A trip, a long way somewhere
  4. 5. Scary someone
  5. 6. Be given, for example: "... a letter"
  6. 8. Feeling well, not being ill
  7. 10. Horrible, very bad
  8. 14. You can see them when you sleep