---_______ the farmers discovered the entrance to the secret cave in the valley?--- Totally by chance.
_____ Shanghai you see today is quite _____ different city from what it used to be. A. The, 不填 B. 不填, the C. The, a D. A. a
—How many people are still leading ____ life under ___ poverty line in the world?—Perhaps one fourth.
He kept sending her presents in an attempt to win her _______.
The experiment turned out to be , which wasn’t ______ they wanted.
Mr. Barret doesn’t think that all bad language should be allowed. In his opinion, there are ______ that should be kept up.