The oldest form of land travel is

Walking was a slow and tiring way to get around. Being a __________ was also painful sometimes.

The invention of the __________ changed how people traveled.

The bicycle was made of wood and did not have__________

Other inventors were developing an internal __________ engine fueled by gasoline.

Buses and taxis are used for

______________ are boats that can stay underwater for months.

________________ carry people and cars short distances across water.

Engineers have begun to design cars that run on ___________ fuels.

__________ transport people and cargo great distances

__________ were one of the earliest ways to fly.

Regular commercial _________ take seven hours to fly between these two cities.

___________ are specially useful for rescue and emergency work.

Only astronauts travel in ________ now.