该国目前正在经历重大的政治变革。

The country is currently ___undergoing major political change.

他正在因心脏问题进行手术。

He is ___undergoing surgery for a heart problem.

如今，我的国家正经历着非常困难的金融和社会状况。

Nowadays, my country is ___undergoing a very difficult financial and social situation.