补全对话（有两项多余）。

A. I think he was clever. B. But I think electricity is very useful. C. he knew nothing about electricity. D. That sounds terrible! E. I agree with you. F. he knew a lot about electricity. G. It was foolish of him to do that!

A: Lily, I heard that a high building on Xihuan Road was on fire yesterday.

B: How could it happen?

A:It's said that the owner of a flat put a piece of metal（金属）in the microwave and it caused fire.

B: Didn't he know it was dangerous?

A: Maybe he was an old man and

B: Well, perhaps you are right. Sometimes I think electricity is very dangerous.

A: It brings lots of convenience to us.

B: I think it's important to teach people how to use it in a right way.

A: Well,