将下列句子改为定语从句!

9,Xi'an is one of the few cities with city walls。Its walls remain as good as before。Xi'an is one of the few cities with city walls,which remain as good as before。或：Xi'an is one of the few cities,the walls of which remain as good as before。或：Xi'an is one of the few cities,whose walls remain as good as before。10,Shanxi Province is a place with many cultural relics。They are well looked after。Shanxi Province is a place with many cultural relics,which are well looked after。