1.St Petersburg is a very beautiful city.It was once called Leningrad.
St Petersburg is a very beautiful city,which was once called Leningrad.
2.I remember the soidier.He told me not to tell anyone what I had seen.
I remember the soidier who told me not to tell anyone what I had seen.
3.The soldiers moved the boxes to a mine.They wanted to hide them.
The soldiers moved the boxes they wanted to hide to a mine.
4.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 whose walls remain as good as before.
5.Shaanxi Province is a place with many cultural relice.They are well looked after.
Shaanxi Province is a place with many cultural relics,which are well looked after.