Ответ:

  1. Harry is too young to fight Voldemort alone.
  2. The stairs in Hogwarts move too fast for Neville to walk safely.
  3. Hermione is clever enough to solve the difficult riddle.
  4. Ron is too hungry to wait until dinner.
  5. The room is big enough for all the students.
  6. The potion is too dangerous to drink.