给下列句子排序，使其成为一段完整的对话

    3    Walking is good. Look at the sun. It's a fine day for walking today.

Because my bike is broken (坏了).

Good morning, Jack! How do you usually go to school?

   5     Yes, but not today.

Why?

That's right. And the air is nice and clean today. What about you? Do you often go to school by bike?

I usually go to school by bike. But sometimes I go on foot. I like walking.