根据对话情景及首字母提示, 填入所缺的词完成对话, 每空一词。

A: Ben, I have some questions about your country, Canada.

B: Okay. What do you want to know?

A: What are you s____ to do when you meet someone for the first time?

B: You're supposed to s____ hands.

A: How about time? For example, when a party is at eight o'clock, do you go at eight o'clock?

B: No, you can go about fifteen minutes late.

A: OK. Is it the same for business meetings?

B: Oh, no. For a business meeting, make sure you're o____ time.

A: Mmm…… , I heard that it's rude to make n____ when you eat. Is that true?

B: Yes, it is. You shouldn’t do it.

A: One more question, are you supposed to take a gift when you visit someone?

B: Yes, it's p____ to take some flowers.

A: Thanks. Now I’m ready.

读材料一、二，完成下列问题．

材料一：黄河流域图

材料二：黄河不同河段水文站测得的河流含沙量：