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1. Her many friends, among whom I like to be considered, gave her encouragement.
2. Her father, who she looked after for over twenty years, died last year.
3. The bed which I sleep on has no mattress.
4. There wasn't any directory in the telephone box, which I was phoning from.
5. The chair which I was sitting on suddenly collapsed.
6. Mr.Smith, whom I had come specially to see,  was too busy to speak to me.
7. I saw several houses, most of which were quite unsuitable.
8. The office which Graham took us to was filled with books.
9. Mr.Marks, whose farm the stream flows across, is unhappy about the plans for the new dam.
10. They picked up five boat-loads of refugees, some of which had been at sea for several months.

1. Her many friends whom I like to be considered, gave her encouragement.

2. Her father whom she looked after for over twenty years, died last year.

3. The bed on which I sleep has no mattress.

4. There wasn't any directory in the telephone box, which I was phoning from this box.

5. The chair on which I was sitting suddenly collapsed. 

6. Mr.Smith, whom I had come specially to see, was too busy to speak to me.

7. I saw several houses, which were quite unsuitable.

8. The office which Graham took us to was filled with books.

9. Mr. Mảks, whose farm the stream flows across, is unhappy about the plans for the new dam.

10. They picked up five boat-loads of refugees, which had been at sea for several months