⑴

A. Some children go to school on foot in Munich, Germany.

a. They must stop at a red light.

⑵

B. Some children in Xinjiang, China, go to school by ferry every day.

b. Don't run in the plane.

⑶

C. In Alaska, USA, it snows a lot. Some kids go to school by sled. It's fast.

c. They must wear life jackets.

⑷

D. In 2009, children in Papa Westray, Scotland, went to school by plane.

d. Don't let the dogs run too fast.