I would rather buy a house in the countryside than in the city.
There is such a problem _____ we all should _____.
How long do you believe it will be _____ Chinese people land on the moon?
The position _____ he wants to apply is difficult to get.
I can hardly say which dish is best –it’s simply a(n) _____ of personal taste.
-The accident might not have happened had we been more careful.-But we _____ at that time.