A: Hello, Kate. ____
B: That's beautiful. I like it.
A: ____
B: I need four.
B: They're funny.
A: You can also buy a T-shirt for your friend.
B: ____
A. Good idea.
B. What about these caps?
C. Come and look at this cap.
D. How many caps do you need?
E. Let's go.
究其他一些物质如氧化铝是否也可作过氧化氢分解的催化剂．请你一起参与他们的探究过程，并填写下列空白．
提出问题氧化铝能不能作过氧化氢分解的催化剂呢？
做出猜想氧化铝能作过氧化氢分解的催化剂．
It is very dangerous children to cross the busy street.
