What is the conversation mainly about?

W: Bob, you went to Brazil, didn’t you?
M: Yes, I did.
W: So what happened?
M: Well, I went into the meeting and there were about, er... seven or eight people in there and I just said "Hello" to everybody and sat down. Apparently, what I should have done is to go round the room shaking hands with everyone individually. Well, you know, it’s silly of me because I found out later it upset everyone. I mean, I think they felt I was taking them for granted.
W: Well, it is very interesting. How about your friends? Can you show us some examples?
M: Well, one of my friends Kate. When she was in France the first time, she finished a meeting with "Goodbye, everyone!" to all the people in the room. There were about half a dozen people there but she was in a hurry to leave, so she just said that and left. Well, she later found out that what she should have done is to shake hands with everyone in the group before leaving. Now, apparently, it’s the polite thing to do.
W: Well, people shake hands in different ways, don’t they?
M: Oh, yes, that’s right, they do. See, normally I shake hands quite gently when I meet someone. So when I went to the U.S. for the first time, I think people there thought my weak handshake was a sign of weakness. Apparently, people there tend to shake hands quite firmly.
W: And how about using first names? Have you made any mistakes there?
M: Oh, yes, I have! When I first went to Italy I thought it was OK to use everyone’s first so as to seem friendly. And I later discovered that in business you shouldn’t use someone’s first name unless you are invited to. Oh, and you should always use their title as well.
W: Well, that really sounds embarrassed. Any other embarrassing experiences?
M: Hm, yeah, when my friend Kate met people in Russia, they seemed to be puzzled when she shook hands with them and said "How do you do?" Well, what they do when they greet a stranger is to say their own name, so she had that all wrong!
W: Oh, yes, I agree with that. Remembering names is very important. What do you think of business cards, Bob?
M: I found them very useful when I was in Japan. Each person can clearly see the other’s name and the job title on the card. And I found that you have to treat business cards with respect. What you’ve got to do is hold them with both hands and then read them very carefully. What happened to me was the first time I just took a man’s card with one hand and put it straight into my pocket.
W: Well, it is important to learn if you want to avoid making mistakes.
M: Yes, the most important is to avoid misunderstanding.
W: Thank you, Bob! Thanks for sharing your experiences with us.
M: Welcome.
Questions:
9. What is the conversation mainly about?
10. Who might be the people Bob met in various countries?
11. Which countries has Bob visited, according to the conversation?
12. According to Bob, which one is true about shaking hands?
13. According to Bob, which one is true about using the first name?
14. According to Bob, which one is true about business cards?
15. What is the main message that the speakers want to tell us?