Emoji idioms

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Across
  1. 2. speak of the ...
  2. 5. once in a blue ...
  3. 8. ... flies
  4. 9. It's not ... science
  5. 10. ... potato
  6. 11. ... eye to eye
  7. 12. you can't teach an old ... new tricks
Down
  1. 1. It's ... cats and dogs
  2. 3. don't judge a book by its ...
  3. 4. don't count your chickens before they're ...
  4. 6. time is ...
  5. 7. kill two ... with one stone