2, Children are obliged to live with their parents when they reach the age of 16.
3,Do I have to tip in a coffee shop?
4, The staff needn't wear vests in their company.
5, We should keep our traditional customs.
6, You must entering your shoes before entering a temple
7, You mustn't take photos at some scarced place.
8, Jane doesn't have to get up early on Saturday afternoon
9, You should ask about their customs
10, How about looking the information in the Internet?
