用be(are/is) comfortable uncomfortabie crowed expensive cheap not crowded

用be(are/is) comfortable uncomfortabie crowed expensive cheap not crowded
1.Let's go by train.It's only one yuan.
Travelling by train _____ ____________
2.All our new buse have air-conditioning.
Travelling on the new buses____ _______
3.Oh,dear!Why are these so many people?
The MTR____ ___________
4.I paid 200 yuan to come here.It's alot of money.
Travelling by taxi ____ _________
5.there aren't many people traveling on the ferry.
The ferry is _____ __________
6.I don't like the old buses.They have no air-conditoning.
Travelling on the old buses _____ ________