Ответ:

a)

  1. Look at the board.
  2. Come in.
  3. Don’t be late.
  4. Don’t drive fast.

b) Tony can swim and ride a bike, but he can’t play the guitar or cook. Ann can swim and play the guitar, but she can’t ride a bike or cook. Bill and Sue can ride a bike and cook, but they can’t swim or play the guitar.