将下列两个简单句合并成一个含有非限制性定语从句的复合句。 1. I am reading Harry Porter. I

1. I am reading Harry Porter, which is an interesting book.
2. He failed in the exam, which made his parents angry.
3. He has two sons, both of whom are teachers.
4. Recently I bought an ancient Chinese vase, the price of which was very reasonable.
5. Last week, two persons came to see the house, neither of whom wanted to buy it.
6. I have lost the pen, which my father bought for my sixteenth birthday.
7. Do you see the house, the windows of which face south?
8. He must be from Africa, which can be seen from his skin.
9. The book, for which he paid 6 yuan, is worth reading.
10. She is a teacher of much knowledge, from whom much can be learned.