Sam has two toy cars. Now he is playing with them. Sam says, "One, two, go!" Car 1is up the hill(小山)and turns right. It goes fast. Car 2 is down the hill and turns left. It goes fast, too. Then Car 1 turns left and Car 2 turns right. Now they are at the station(车站).

Turn left, Dino.

This is right.

Where are they?

The black dog turns right.

Are you traffic policemen?