Английский язык, 10 класс

Travelling by boat is more comfortable than travelling by car. However travelling by car isn't as expensive as travelling by boat. Travelling by car is more dangerous than travelling by train. However travelling by train is tiring. Travelling by plane is safe, but it is more expensive than travelling by train. What is more travelling by train is slower than travelling by plane. Travelling by plane is more polluting than travelling by boat. However travelling by boat is more relaxing.