“吃惊的”用英语怎么说

鲍勃试着推了推门。令他吃惊的是，门竟然开了。Bob tried the door. To his surprise it opened.然后，令人吃惊的是，后门被宾顿猛地拉开了。Then, startlingly, the back door was jerked open by Binton.令他们吃惊的是，开车的居然是个6岁的小男孩。They were astonished to find the driver was a six-...