1. There are twelve classes at my school.

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

3. Ha is more hard-working than Quang.

4. Lan has a long black hair.

5. Shall we play volleyball this afternoon? 

6. There isn't a bookshelf in my bedroom.

7. The computer is in front of the dog.

8. My favorite subject is English.

9. Phong lives with his parents and his little sister.

10. I am student at Cau Giay Primary school.

11. Her hair is long and black.

12. There are many beautiful beaches in Vietnam.

13. Minh is the tallest in his class.

14. The museum is in front of the hospital.

15. Lan's house is more expensive than my house.