Xi’an, or Chang’an as it was called for many centuries,     1    (be) a built-up urban area for over 3000 years, and once served as capital for 13 dynasties. It is home     2     which many immovable cultural heritages，three of     3     are on the UNESCO’s world cultural heritage list.

These days，the city has made effective exploration in     4     (build) modernity while preserving historical legacy(遗产). A recent piece of news announced by Shaanxi’s cultural relic authority caused nationwide attention     5     a ruin of ancient capital dating back to Qin Dynasty was unearthed during the construction of the Xi’an MetroLine 5. In order to protect the ruin，the metro line may have to change     6     (it) route.

    7     (face) with the heavy and important，task of protecting cultural relics while promoting urban construction，Xi’an made active     8     (attempt). Rails of the metro system are built 15 to 20 meters underground in order to protect the ancient tombs which are     9     (usual) buried in the layer within 5 meters from the surface level. Besides，the metro constructors have also painted the walls inside the stations with historical stories，presenting     10     visual feast for citizens.