这个问题出乎意料，她一时语塞。

The question was unexpected and she was temporarily ___at ___a ___loss ___for ___words.

如果是詹姆斯，我会无言以对，我不知道该告诉他什么。

If it was James I would be ___at ___a ___loss ___for ___words, I didn't know what to tell him.

听到这个悲惨的消息，他完全说不出话来。

Upon hearing the tragic news, he was completely ___at ___a ___loss ___for ___words.