One day, Susan went back home and asked her mother about something.

Susan : Mum, my teacher told us some children went to school on walk. Was it really?

Mum : Yes, my baby. That's true.

Susan: How did you go to school when you were 10 years old?

Mum: Mm, I went to school on walk. Every morning, when the sky was so dark, I must walk from one village to another one about 2 hours. But now, you can go to school by bus or by bike.

Susan : So, there weren't any bus?

Mum : No, there weren't. Now, there were some buses. The city is quite different now.