The dog, if trained ____, will be made a good watch-dog one day.
We went right round to the west coast by ______ sea instead of driving across ______ continent.
—Could you tell me the way to ____ Johnsons, please? —Sorry, we don’t have ____ Johnson here in the village.
In many places in China, ___ bicycle is still ___ popular means of transportation.
—Hello, could I speak to Mr. Smith? —Sorry, wrong number. There isn't______ Mr. Smith here.
_________ worries me the way he keeps changing his mind.