What's this?
It's a post office.
What are these?
They're countries.
What's this?
It's a hot-air balloon.
What's this?
It's traffic.
What's this?
It's a ferry.
What's this?
It's an aeroplane.
What's this?
It's a helicopter.
What are these?
They're continents.
What is fast, can carry 2 people, and goes on land?
It's a motorbike.
What has a driver, can carry between 4-7 people, and goes on land?
It's a taxi.
What's this?
It's a museum.
What travels really fast across cities, can carry many people, and has many wheels?
It's an underground train.