Use of English I Crossword review

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Across
  1. 3. / lead to
  2. 5. / make something more exciting
  3. 9. / be connected to
  4. 10. / arduous, exhausting
  5. 11. / mistake, foolish comment
  6. 12. / collapse (e.g. a deal)
  7. 13. / make something happen, esp. something involving violence or angry feelings
  8. 15. / fail a test or a course (mainly American, informal)
Down
  1. 1. / look at something quickly and secretly
  2. 2. / wander around in a relaxed way
  3. 4. / not willing to do something
  4. 6. / giving you feelings of sadness
  5. 7. / have in mind; provide people with everything they need
  6. 8. / smile showing your teeth
  7. 14. / pick up something quickly with your fingers