Key to B4U1
Preparation 3, P2
6. When you buy something from an ending machine, if you insert more than enough money,
  the machine will return the change, in the form of coins. What the nurse means is that they
  haven’t managed to get the coin out of the boy yet. So the boy’s condition hasn’t changed.
7. The word “driving” also means powerful.
8. The word “bored” has the same pronunciation as “board”. So here to the listener, it may also
  mean the mother is a member of the private school boar ...