It was not until 1920 regular radio broadcast began.
_____ is known to us all is _____ the theme of Shanghai Expo is “Better city, better life”.
Be careful! The slightest spark could _____ the fireworks.
You _____ be tired-----you took a rest only five minutes ago!
---- Tony, are you available at the moment? I have to ask you a rather personal question. ---- _____.
As a wise department manager, he possesses a unique way to ______ huge tasks into small and doable units.