根据句意及首字母提示写出所缺单词。
1. People in Korea are supposed to b_____ when they meet for the first time.
2. In China people often s_____ hands with each other when they meet for the
first time.
3. My classmates are m_____ boys.
4. You're supposed to k_____ when you meet people for the first time in Brazil.
5. When you are i_____ for a party, you should arrive a little earlier in my
country.