Be pleasant and smile

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Across
  1. 6. optimism
  2. 7. Gesture of introduction
  3. 8. What you do when something's funny
  4. 11. easy to get along with
Down
  1. 1. Pearly whites in your mouth
  2. 2. Happy to meet people
  3. 3. CFO
  4. 4. What you see with
  5. 5. Riddles, Knock-Knock,etc.
  6. 9. Initial greeting
  7. 10. feeling or showing pleasure or contentment