I.

1. You must do your homework before going to school.

2. The air in the city is more polluted than the air in the countryside.

3. Vietnamese people often clean and decorate their house in Tet.

4. giống câu 2

5. It is very interesting to take a boat trip on the Perfume River.

6. She hopes that Mary will come to the party tonight.

7. My village has an old pagoda.

8. Doing our homework is more important than reading noval.

9. Asia is the biggest continent in the world. 

II. 

1. How many children around the world enjoy the cartoon" HOME ALONE"?

2. Why aren't they going to your birthday?

3. What is the longest vacation?

4. What do you do during your vacation?

5. How many hours a day does your mother work?

6. How do you go to school?

7. When did Mai and vy visit Hue?