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18. The dog which is mine won the race.
29. Show me the shoes which you bought yesterday.
20. Our school has a good laboratory in which the students practise chemistry.
21. Edward whose mother died last year has just moved to France.
22. Those are the books which he has just bought from the bookstore.
23. The book which was written by Jane Austen is very interesting.
24. The lady to whom I spoke an hour ago gave me good advice.
25. Is that the computer which your father bought last month?
26. A girl who is now in the hospital was injured in the accident.
27. A man who told me you were away answered the phone.
28. A bus which runs every half an hour goes to the airport.
29. I met Jane's father who works at the university.