请写出下列对话正确的排列顺序。

a. That's too bad! I hate getting on a crowded bus. It's going to rain, isn't it?

b. Yes, it is. Do you think it'll be crowded on the bus?

c. I hope not! But it's usually crowded at this rush hour.

d. Me, too. But at least it isn't raining now.

e. Yes. It looks like rain. But I forgot my raincoat.

f. The bus is always late, isn't it?

排列顺序：