TASK DEFINITION: Two analogies that relate places/locations to the associated travel mode is given in the form "A : B. C : ?". "A : B" relates place A to travel mode B. Your task is to replace the question mark (?) with the appropriate travel mode for the given place C, following the "A : B" relation.
PROBLEM: office : car. moon : ?

SOLUTION: rocket

PROBLEM: island : boat. downtown : ?

SOLUTION: subway

PROBLEM: airport : train. park : ?

SOLUTION:
bicycle