Some people never know what they need ______ they lose it.A. until B. as C. after
Mr. Stevenson is great to work for—I really couldn't ask for a ________ boss.
The old building still looks beautiful. It is about _______________.
___________ have you ___________ the meat?
Tom is one of the ____________ students in our class.
—Is ________ here?—No, Peter and Tony have asked for leave.