If there are _____people driving, there will be ______air pollution.—Yes, the air will be fresher and cleaner.

Shall we take the 10:20 train? — NoIf we took that train, we ________too late

The opening ceremony of the Olympic Games will be broadcast ______ this weekend. You can expect an exactly ______ night.

The Browns had the house painted brown when they moved in,____________?

The story of Tom Sawyer ______ in Missouri, America,in the 19th century.