HJÆLP - HURTIGT! Henførende stedord

Hej, har jeg skrevet de rigtige henførende stedord(dem der er streget under) eller er det helt forkert? Er meget i tvivl om det skal være which/that og om de andre er rigtige. Håber i vil hjælpe mig, det haster! :) 

1. I know a boy who is from England.
2. I have read a book which is interesting.
3. My uncle is an Irishman who is very rich.
4. I am from Copenhagen which is in Denmark.
5. I met a girl who had lovely blue eyes.
6. This is the boy who book is on the table.
7. Here is the man to who she gave the book.
8. A mother is a woman who has a child.
9. Peter, who father is a baker, is my friend.
10. The woman to who you smiled is my aunt.
11. My sister has a little ball which is red.
12. I have a brother who is twelve years old.
13. I know a girl who dog is very old.
14. The teacher looked at the boy who laughed.
15. Jane is a girl to who you sent the letter.
16. There is the man who son is a millionaire.