Ответ:

  1. Badminton is boring. I think football is more exciting.
  2. My mum’s bike was more expensive than mine. It cost a lot of money.
  3. Paris is a very attractive city. I think it is more beautiful than Dublin!
  4. Surfing the internet is more interesting than reading books. Reading books is boring.
  5. Flying a plane is very difficult. It’s more complicated than driving a car.
  6. Football is a more popular sport than chess. A lot more people play football.

Кратко: у длинных прилагательных сравнительная степень образуется с помощью more.