1. 1945 was the year. The second world war ended then (when)
2. That's the hotel. I stayed there last summer (at which) 
3. July is the month. Most people often go on holiday then ( in which )
4. The books are very interesting. They were bought long ago (which )
5. He often tells me about his village. He was born in that place ( where) 
6. The man is our E teacher. He comes from Australia ( coming )
7. I found a man's wallet. He gave me a reward ( whose)
8. This is the book. I'm looking for it ( for which )
9. The lady gave me good advice. I spoke to her an hours ago ( to whom)