从方框中选择正确的单词，将其适当形式填在空白处，使对话完整、正确。
die, what, scientist, change, something
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A: Have you learned Topic 2, Unit4?
B: No, not yet. We will begin to learn it next week.
A: But we've learned it. It's about some ____ like Edison, a great American inventor.
B: I have read about Edison in a book, so I know ____ about him.
A: Really?
B: Yes. He invented a lot of things. And they all have ____ the world.
A: I know he was born in 1847, and died in 1931.
B: So he has been ____ for more than eighty years.
A: Yes, but we can remember him every day.
B: Sorry, I don't understand ____ you mean.
A: Do you give your friend a call every day?
B: Yes. Oh, I see. Edison invented the telephone.
