1.Vietnam's New Year is known as Tet Nguyen Dan or Tet.
2. Yes, it is.
3. The Lunar New Year begins between January twenty-first and February nineteen.
4. Vietnamese people usually tidy their house, cook special food, clean and make offerings on the family altars to prepare for Tet.
5. Yes, they do.
6. No, it doesn't. It lasts ten days.
7. Because Vietnamese people believe that how people act during those days will influence the whole year.