It was some time _____ I realised the fact that life had become difficult for many villages in western Europe.

_____ is known to us all is _____ the theme of Shanghai Expo is “Better city, better life”.

— Excuse me!— _____— How can I get to the nearest post office?

______seems to be no possibility that the student majoring in liberal-arts can win the first prize in the100-meter race.

As the little boy ______ milk now, he doesn’t want to eat any other food.