=>
1/
1. Vietnamese people cook special foods to make preparation for Tet.
2. I went to school last Sunday.
3. I go to the zoo every two week.
4. There are many trees in my village.
5. He visits his family twice a year.
2/
1. Although he is intelligent, he can't answer that question.
2. In spite of being a poor student, Minh studies well.
3. Despite staying up late, Lan gets up early to do homework today.
4. It is raining heavily; however, we go out.
5. Although they are poor, they are always happy.
6. In spite of being rich, he doesn't buy a house.
7. They are poor; nevertheless, they are kind and generous.
8. In spite of the bad weather, they went camping yesterday.
9. Although he is busy, he still helps his mother with housework.
10. Although she is beautiful, people don't like her.