Đặt câu hỏi cho từ gạch chân: It has been the national day of Viet Nam since 1945. Hung Kings are the founders of our nation and they became the first kings of our country

Đặt câu hỏi cho từ gạch chân:
1, It has been the national day of Viet Nam since 1945
2, Hung Kings are the founders of our nation and they became the first kings of our country
3, Must ethnic peoples in viet nam speak their own languages 
4, In the central highlands, the biggest and tallest house in the village is the communal house 
5, They are working in a factory
6, They went to Sapa
Những từ bị gạch chân: 1. Since 1945
2, Hung Kings
3. Their own languages
4. The communal house
5. In a factory
6. Sapa