=>
I/
1. They shouldn't wear hats in the pagoda.
2. You should ask them about their customs.
3. Do I have to tip in a coffee shop?
4. Staff don't need to wear vests in their company.
5. We should keep our traditional customs.
6. You must remove your shoes when entering a temple.
7. You mustn’t take photographs at some sacred places.
8. It's Saturday tomorrow, Jane doesn't have to get up early.

II/
1. people
2. delta
3. rice
4. groups

III/
1. celebrate
2. traditional
3. therefore
4. served