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!
