A: Good morning. Can I help you?
B: ____. I'd like some apples.
A: Oh, we have very nice apples here.
B: ____
A: Ten Yuan a kilo.
B: Three kilos, please.
A: What else do you want? ____. They are only six yuan a kilo.
B: Good idea.
A: ____
B: Two kilos please.
A: ____Forty-two Yuan, please.
B: Thanks.  Here is the money.

A.Here you are.
B.How about some bananas?
C.Yes, please.
D.How many bananas do you want?
E.How much are they?

我国是世界上发现、利用金属锑（Sb）较早的国家之一，目前锑的产量位居世界第一．冶炼金属锑的过程中，发生的反应为：2Sb₂O₃+3C $\underset{\_}{\underset{\_}{高温}}$ 4Sb+3CO₂↑，此反应中，表现出还原性的物质是（   ）

根据句意及首字母提示完成单词。