1.The girl with a shawl on her head is a member of the Thai . ( who )

> Who is the girl with a shawl on her head?

2. The Khmer have three main festivals in a year . ( how many )

>How many many festivals do the Khmer have in a year?

3 .Odu is the smallest ethnic group in vietnam.( which )

> Which is the smallest ethnic group in Vietnam?

4.Ok Om Bok Festival is the biggest festival of Khmer people. ( what )

> What is the biggest festival of Khmer people?

5.We can find terraced fields in the northern mountainous regions . ( where)

>  Where can we find terraced fields?

6.Bom Bo village is about 200 kilometres from Ho Chi Minh city ( how far )

> How far is Bom Bo village from Ho Chi Minh city?

7. They built their houses on stilts to prevent flooding from tides or storms . ( why )

 >Why did they build their houses on stilts?

8. The population of the Tay ethnic group is about 1.7 million . ( what )

>What is the population of the Tay ethnic group?