Translation of "be astonished" into Italian

But when you ride in it and find how smooth it runs, you'll be astonished.

Ma quando la si guida e si scopre come scivola dolcemente... si rimane stupiti.

“And the people began to be astonished because there was no darkness when the night came.

“E il popolo cominciò a stupirsi perché non ci fu oscurità quando venne la notte.