1. According to the pasage, what is an essential part of Vietnamese cuisine and culture?
-> An essential part of Vietnamese cuisine and culture is Square cake.
2. Where do people place Square cakes to honor the ancestors?
->People place Square cakes in the family altars to honor the ancestors.
3. Who invented the cake?
-> Prince Lang Lieu invented the cake.
4. According to the old belief of the vietnamese, what was the shape of the Earth?
-> The shape of the Earth was square.
5. Why could Lang Lieu become the next Emperor?
-> Because of the special meaning and delicious taste of the cakes, Lang Lieu became the next Emperor.