1/ This is the house in which we often stay in summer.
2/ I'll show you the second hand bookshop in which you can find valuable books.
3/ I have not decided the day when I'll go to London on.
4/ He was born on the day when his father was away on.
5/ The book, which we can look up telephone numbers in, is a telephone directory.
6/ This is a rare opportunity which you should take advantage of to get a better job.
7/ The boy, whom you made fun of, is my cousin.
8/ This matter, which you should pay attention to, is of great importance.
9/ The man, who I respect most, is my father.
10/ The man, whose opinion is respected most, is my father.
