As the world’s population continues to grow,the ________ of food becomes more and more of a concern.
There is no student _______ wants to go to university.
____, he sometimes makes mistakes.
—How did you know it? —Well, the news ____ all over the town.
I lost my way in complete darkness and ,______ matters worse , it began to rain .
The direction _______ which the president would go was kept secret ________ safety concern .