Tom hid himself behind the door, _________ he could hear the steps of his mother clearly.

_______inmy life impressed me so deeply as my first visit to the Palace Museum.

I don’t know ________ up so early last Sunday.

. It’s not considerate (体贴人的) ________ you to take__________ of the little boy.

The police stillhave found the lost child, but they’re doingall what they _____. [ ]