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Going on foot is .
the slowest
slower
Compare
Going by bus is fast.
Going by train is .
Going by plane is
.
faster
the fastest
Taking a bus is .
Riding a bike is .
the cheapest
Going by underground is
cheap.
cheaper
Taking an underground is
expensive . .
Taking a taxi is
.
But taking a plane is
.
more expensive
the most expensive
crowded 拥挤的
Taking a bus is .
Taking a train is .
Taking a subway is
of the three.
crowded