Kate: You're late today! I have waited here for twenty minutes.
Paul: I'm really sorry.【小题1】
Kate: Why didn't you drive your car? It's faster than taking a bus.
Paul: 【小题2】
Kate: Really? But why?
Paul: Because I think it's our duty to care for our environment.
Kate: You have changed a lot.【小题3】
Paul: I joined a volunteer club-Green Helper.The environmental problem is becoming more and more serious.It is time to take action to protect the environment, such as taking short shower, recycling books and paper, 【小题4】
Kate: Well. They are easy and useful.But it's not convenient to go to work without driving a car.
Paul: 【小题5】
Kate: Good idea. You're living a low-carbon(低碳) life and it's also a good way to exercise.

A．What made you do that?

B．I had to wait for a bus for a long time.

C．What's wrong with your car?

D．I am going to buy a bike and then ride to work.

E．I won't drive unless it is necessary.

F．turning off the lights before leaving.