一Excuse me.I want to buy some stamps,but I can’t find a post office.一I know________ nearby.Come on,I’II show you.
Once again he failed to hand in his homework _____ he had been given enough time to do it.
. _____ the book four times, I finally understood the author's theory.
Mike seldom asks ____ questions in class, but today he raised _____ fairly good one.
_____ the news, so far, has been good, there may be days ahead when it is bad.
. Although ________ after the Civil War, the American blacks still took no important role in the white Americans except as servants and laborers.