1. This famous picture, which was damaged during the war, is worth thousands of pounds.
2. If there were air and water on the other planets, there would be life.
3. My friend asked me if there was a taxi coming then.
4. Although the cafe was crowded with people, we found a table.
5. Although English isn't easy, I like to study it.
6. The woman you saw last night is very nice.
7. The driver who took us to the airport yesterday was very friendly.
8. Do you remember the film that was shown on TV last night?
9. The boy playing badminton is my friend.
10. The building, which was destroyed in the fire, has now been rebuilt.
11. The man who came to the meeting early was my teacher.
12. Because of his sickness, he didn't go to school yesterday.
13. The river, which is polluted, is not good for swimming.
14. Mr. John, who lives in a small house, is the one we met at the party last night.
15. Even though the lesson was long, it was interesting.