当我听到这个令人震惊的消息时，我哑口无言。

I was ___speechless when I heard the shocking news.

第一次看到大峡谷时，我惊讶得说不出话。

Seeing the Grand Canyon for the first time, I was ___speechless.

她的表演如此惊人，以至于观众都哑口无言。

Her performance was so amazing that the audience was left ___speechless.