People idioms

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Across
  1. 3. He's not very friendly, rarely smiles, a _ fish.
  2. 5. He's good at problem solving ,a smart _.
  3. 6. He doesn't talk to anybody around, a _ wolf.
  4. 8. Don't tell her your secrets ,she has a big _.
Down
  1. 1. She comes to class before everyone, an early _.
  2. 2. She loves parties, a __ butterfly.
  3. 4. He only wants to lie down and watch TV , a _ potato.
  4. 7. He works better at night, a night _.