The key answer of exercise 3

b)

1. by plane, by train, by car, by bike, on foot, by ship
2. with a Driveaway car (by driving someone's car across the US), by working on a ship

c)

by car

• good → he was able to stop and visit a few places on the way; he loves driving; he loves cars
• bad → you can’t choose the date or the place you want to go

by ship

• good → he learnt a lot; he enjoyed the slow life; he loved watching the sun go down
• bad → difficult to find a ship; you need time to travel