C

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Across
  1. 1. isn't successful
  2. 3. can be used to fly
  3. 5. to say “yes”
  4. 7. uncertain、 not sure
  5. 8. worried about sth
Down
  1. 2. great painter、great musician
  2. 4. the first step to go further
  3. 6. go into sth