Exercise 6:

1. People decorate their homes with plants and flowers.
2. They visit relatives and friends, and they exchange New Year's wishes.
3. Many people go to pagodas to have a happy new year with their family.

Exercise 7:

1. Antarctica is the coldest place in the world.
2. My father plans to repaint our house before Tet.

Exercise 8:

1. D. thinks (the underlined "th" sound is different)
2. C. plays (the underlined "a" sound is different)
3. B. suits (the underlined "oo" sound is different)
4. A. boxes (the underlined "o" sound is different)
5. D. tasks (the underlined "a" sound is different)
6. A. dreams (the underlined "ea" sound is different)
7. B. stages (the underlined "a" sound is different)
8. C. assures (the underlined "u" sound is different)