1. Vietnam's New Year known as Tet Nguyen Dan or Tet.

2. Yes, it is.

3. It begins between January twenty - first and February nineteen. 

4. Vietnamese people usually make preparations for the holiday several weeks beforehand.

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.

`1.` Tet Nguyen Dan or Tet.

`→` Thông tin: It is especially known as Tet Nguyen Dan, or Tet. 

`2.` Yes, it is.

`→` Thông tin:  Vietnam’s New Year is celebrated according to the lunar calendar. 

`3.`  It begins between 21th January and 19th February

`→` Thông tin: It begins between January twenty- first and February nineteen.

`4.` They tidy their houses, cook special food, clean and make offerings on the family altars.

`→` Thông tin: Vietnamese people usually make preparations for the holiday several weeks beforehand. They tidy their houses, cook special food, clean and make offerings on the family altars. 

`5.` Yes, they do

`→` Thông tin: On the New Year’s Eve, people sit up to midnight to see New Year Eve, then they put on new clothes and give one another the greetings of the season. 

`6.` No, it does not

`→` Thông tin: Tet lasts ten days. 

`7.` Vietnamese people believe that how people act during those days will influence the whole year.

`→` Thông tin: The first three days are the most important. Vietnamese people believe that how people act during those days will influence the whole year.