The driver on his mobile phone.

When we are riding a bike, we must all the time.

—She _____ the horse and broke her leg.

—I'm very g you like it.

Betty: I was late for school today.

Mum: Why?

Betty: I took the bus. There was a road accident, and the traffic was very heavy. But nobody was late except me.

Mum: It's the most comfortable way, but it's also the most expensive. And taxis are very slow in heavy traffic too.

Betty:

Mum: That's a good choice, but it's a bit dangerous. There's so much traffic.

Betty: But most of my classmates ride bikes, and it's quite safe. Don't worry. I'll be careful.

Mum:

Betty: He lives the farthest from school, so he takes the underground.

Mum: And what about Lingling?

Betty: So she walks.

Mum: How about Daming?

Betty: He goes by bus too, the same as me. But it's so crowded! And the traffic is heavy.

Mum: All right. You can ride your bike to school, but remember to be careful all the time.