16.Do you still remember the day which you joined the Party?
17.This is the boy his handwriting is the best in our class
18.It was the meeting which importance I didn't know.
19.My father，that has been away recently, wants to see you.
20.He has three sons，two of them are music lovers.
21.As you know it，he has left for America.
22.Miss Li，who you met，is our English teacher.
23.The computer center，that was opened last year，is very large.
24.My pen which writes smoothly was given to me by my sister.
25.Those who wants to see the film put up your hands.
26.Those have seen the film think highlv of it.
27.That is the way which they work.
28. I have made the same mistakes like you have.
29.Here is,so big a stone as no one can move it.
30.The news which a war broke out in the Middle East surprised us.
20.改two of them为two of whom