1 When people travel on foot, they usually see the wildlife in the forests.
2 When we travel by bus, we sometimes go to some places of interest.
3 When people travel by train, they often make new friends.
4 When we travel by plane, we sometimes watch beautiful sunsets and sunrises.
5 When we travel by air, we seldom meet a lot of people.
6 When people travel by water, they usually spend a lot of money.
7 When people travel on foot, they often visit museums and art galleries.
8 When we travel by bus, we sometimes enjoy sightseeing.
9 When people travel by bus, they usually stay in hotels and holiday centres.