1 the girl who chatted with you yesterday is my cousin

2 the man who spent 15 minutes measuring our kitchen is very kind

3 the architect who has moved to HCM city designed these flats

4 the young boy who rides an expensive motorbike is naughty

5 I'm reading the book which I bought in 1996

6 do you know the man who is sharing the flat with me?

7 the young man who is talking to our teacher is Ba's brother

8 we visited the monument which was built a hundred years ago

9 the boys are interested in the game which is a popular game all over the world

10 You have no need to tell me the reason for which you are often late for work.

11 we visited the people who are homeless after the flood

12 I don't like the films which have unhappy ending

13 I know the man whose son broke your windows

14 the girl whose parents work with me is very kind

15 the village has around 200 people the majority of whom are farmers

16 she hasn't eat anything which makes her parents worried

17 the student who sits next to me is from China

18 I thanked the woman who had helped me 

19 mr.pike whose course I am taking is excellent

20 shakespeare wrote plays which people have enjoyed for four centuries

II.1 who

2 who is

3 which

4 which

5 who

6 who

7 on which

8 that are

9 who owns

10 that

11 that

12 that

13 that

14 which

15 which

16 which

17 whose