crossword puzzle

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Across
  1. 3. The final or most important thing.
  2. 5. An advantage or good result from something.
  3. 7. To look into something carefully to find out more about it.
  4. 11. To make something better.
  5. 12. Very important and necessary.
  6. 13. Not enough or not suitable for a purpose.
Down
  1. 1. To give a brief explanation of the main points.
  2. 2. To go backward or turn something backward.
  3. 4. The ability of the body to fight off diseases.
  4. 6. The way you see or understand something.
  5. 8. Ready to be used or obtained.
  6. 9. To get rid of something you don't need or want.
  7. 10. Almost not; just enough to be noticed.