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1. who
2. whom
3. who
4. which
5. that
6. whose
7. why
8.  when
9. where
10. who

III/
1. The book which we ordered was very expensive.

2. I thanked the woman who had helped me.
3. She is the most intelligent woman that I have ever met.
4. I have one black cat whose name is Blacky.
5. Sydney, which is not the capital of Australia, is the largest Australian city.
6. Mrs. Jackson, who is very intelligent, lives on the corner.
7. Tom , whom we met yesterday, is very nice.
8. Do you know my youngest sister who lives in New York?
9. I met Jane's father who works at the University.
10. The picture which she was looking att was beautiful.
11. Mary and Margaret, whom you met yesterday, are twins.