Only when she reached her office____ she had left her key at home.

There is no doubt ______ you'll be warmly welcomed by people there.

Nelson Mandela is，__________ the greatest man of the 20th century，certainly among the most extraordinary leaders．

Not until the stadium of Bird’s nest was completed in the end _______ back to their normal position.

 —Are you going to watch the game？ —I'm sure _____ ,for it promises to be a close one.