=>
9. You can buy these things at Dong Xuan market, which is the center of the city.
10. I went to see a dentist who filled three of my decayed teeth.
11. She looked up at the stars which were twinkling in the sky at the moment.
12. We had a good time at the party where there were a lot of friends.
13. I know some people who live in London.
14. He can't forget that day when he first met her.
15. Nam, who got excellent marks in last examination, is going to study overseas.
16. She knows somebody who can sing very well.
17. I saw the men and the cattle that went to the field.
Which -> đtqh chỉ vật
Who -> đtqh chỉ người
Where -> đtqh chỉ nơi chốn
When -> đtqh chỉ thời gian
That -> đtqh chỉ người, vật
