29．Here is, so big a stone as no one can move it．

28. I have made the same mistakes like you have．

27．That is the way which they work．

26．Those have seen the film think highly of it．

25．Those who wants to see the film put up your hands．

24．My pen which writes smoothly was given to me by my sister．

23．The computer center，that was opened last year，is very large．

22．Miss Li，who you met，is our English teacher．

21．As you know it，he has left for America．

20．He has three sons，two of them are music lovers．