补全对话Ben: Hi, Fred. I'm really worried.
Fred: Why?1
Ben: I don't know how to finish my school project. Can you help me think of anything cool?
Fred:2 Let me think.. hmm... I know! The Four Great Inventions!
Ben: The Four Great Inventions? Is it really a good subject?
Fred:3 Think about how important they are in Chinese history! You can see them everywhere in our lives.
Ben: Well,4
Fred: Sure! The Four Great Inventions have left an excellent page in human history. Ben: Great! Do you think it is easy for me to collect the information about this subject?
Fred:5 Almost any information that we need can be found out easily on the Internet now.
Ben: OK. Thank you so much.
Fred: You're welcome.
