.He spent more than twice as much time on the problem _____ I spent on it .
—Shall I attend my friend's comingofage ceremony, Mum?—No, unless you see to ________ that you will be home before 10:00 P.M.
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.