这位艺术家正在修复古老的壁画。

The artist is ___restoring an ancient mural.

专家们正在努力修复这座古建筑的原始风貌。

Experts are working on ___restoring the ancient building to its original glory.

他们正在努力恢复这座历史建筑的原始风貌。

They are working on ___restoring the historic building to its original appearance.