麻烦把下面的句子合成定语从句,前面为主句和后面为主句两种

麻烦把下面的句子合成定语从句,前面为主句和后面为主句两种
1,The remembered the day.She saw Nazis burying something near her home.
2,St Petersburg is a very beautiful city.It was once called Leningrad.
3,I remember the soldier.He told me not to tell anyone what I had seen.
4,The soldiers moved the boxes to a mine.They wanted to hide them.
5,Xi'an is one of the few cities with city walls.Its walls remain as good as before.
6,Shaanxi Province is a place with many cultural relics.They are well looked after.