补全对话。

Melissa: Look! This looks so interesting. There are dragons and frogs on it.  

Li Lei: Ah, it's a great invention of ancient China.  

Meiissa: Really？ When      1     it     2     ?  

LiLei: I think it      3          4     in Han Dynasty(汉朝 ).  

Melissa: What    5   it    6   for?  

LiLei : Guess !  

Melissa:     7     it     8   for holding water?  

Li Lei: No. It   9          10     for testing earthquakes.  

Melissa: Really? But how?  Li Lei: Read this, and you'll know everything.  

Melissa: Wow, it's really amazing. The Chinese are great!