突如其来的公告让他哑口无言。

The sudden announcement left him ___at ___a ___loss ___for ___words.

如果她问我那个问题，我会不知道该说什么。

If she asked me that question, I would be ___at ___a ___loss ___for ___words.

目睹了奇迹之后，他们都哑口无言。

After witnessing the miracle, they were all ___at ___a ___loss ___for ___words.