VI.

1. No, TET holiday is celebrated on the first day of the Lunar New Year.

2. Vietnamese often clean their houses and paint the walls.

3. People often visit their neighbors, friends and relatives.

4. Different kinds of dishes are served in the reunion dinner.

VII. 

1. to comment -> comment

2. has -> have

3. come -> came

4. while -> because 

5. has to -> have to

6. should -> shouldn't

7. these -> they

8. to lower -> lower ( should + V)

9. have -> have to 

VIII. 

1. Lang Lieu couldn't buy any special food because he was very poor.

2. Câu này sai đề nhé bạn , đề phải cho là AND mới đúng -> During Tet, Vietnamese people buy all kinds of sweets and make Chung cakes (as well)

3. Câu này cũng sai đề nhé bạn, sửa lại thành MOREOVER -> The Hung Kinh Temple Festival was a local festival. Moreover, it has become a public holiday in Vietnam since 2007.