aghast

看到幽灵时，她满脸惊恐。

Her face was ___aghast when she saw the ghost.

看到车祸现场的惨状，所有人都惊呆了。

Everyone stood ___aghast at the gruesome scene of the car accident.

看到火灾蔓延的速度，所有人都惊呆了。

Everyone stood ___aghast as they saw how quickly the fire was spreading.