14. That man, whose name I don’t remember, is an artist.
15. The reason which you gave yesterday is not valid.
16. We enjoyed this city, where we spent our vacation.
17. One of the elephants which we saw at the zoo had only one tusk.
18. I looked at the moon which was very bright that evening.
19. My father whom you met this morning goes swimming everyday.
20. The car, the engine of which is very good, belongs to Dr. Clark