这座桥的完工将大大改善当地的交通状况。

The ___completion of this bridge will greatly improve local traffic.

项目完成时我们会开一个庆祝会。

We'll have a celebration upon ___completion of the project.

这栋办公楼将在年底竣工交付使用。

The office building will be ready for tenants upon ___completion by the end of this year.