他完美的魔术表演让所有观众都惊呆了。
His perfect magic show ___dumbfounded all the audience.
他提出的问题如此令人震惊,以至于我们都不知道该如何回答。
His ___dumbfounding question left us all speechless.
听到这个令人震惊的消息,他站在原地目瞪口呆。
He stood ___dumbfounded when he heard the shocking news.