3. My house is behind the post office.

4. Mrs Hoa is Lan's mom.

5. His father usually ride motorbike to work.

6. No one is as inteligent as this boy in his group.

7. That exercise is more difficult than this one.

8. Jack doesn't drive as carefully as he does.

9. This hotel is the most comfortable in this city.

10. Is Mr Kien's son bigger than mr Kien?

11. This is the first time i have been to HCM City.

12. She hasn't taught in this school before 10 years ago.

13. How long has your parents get married?

14. It's 2 years when they last come back to their old school.

15. He has started becoming a good teacher 3 years a go.

16. This is the first time i have this kind of good.

17. The last time we have seen her since Christmas day.

18. Susan began to talk in her school 3 years ago.