(2012年浙江卷,2)The development of industry has been ________ gradual process throughout ________human existence,from stone tools to modern technology.
Before selecting the curtain for your newly decorated house, it's important to know what colors look great ________ the wallpaper.
—What are you two whispering about over there? —Oh, ________.Just small talk.
Frankly speaking, ________ of them knew what the other was doing that morning.
Our refrigerator is ________ again.We'd better buy a new one instead of repairing it.
An artist who was recently traveling on a ferry to the southern island discovered ________ a long lost antique Greek vase.