When I was a student in France, a local friend invited me to have lunch at her home. During the meal, I found all her family had their hands on the table, except me. Later I learned that it's impolite to put your hands under the table.

When I was a student in the UK, I went to a pub(酒吧) with two local friends. We all had a drink and I drank mine quickly. My friends still had half-full glasses so I bought another drink, just for myself. My friends said, "You can't do that. When in a pub in the UK, you should buy drinks for you and your friends." I was so embarrassed.

I spent a year studying in Germany. I was shocked the first time I went to a lecture讲座). At the end of the lecture, all the students started knocking on their desks. How strange! A student told me that in Germany, students don't clap their hands(拍手) to show they like something. They knock on their desks instead.

I love making birthday cards. One day, when I was a student in South Korea, I made a birthday card for a local friend. But when I gave the card to her, she cried, " My name is written in red ink(墨水)!"She said in South Korea, a name written in red ink means that the person has died.