Wang Feng’s _________ our school at the English speech contest proved to be a success.

He lay in bed, listening to the rain _______ the window.

While _________, people sometimes can’t help buying something they don’t really need.

Television lets us see history in the making. We can watch sports, political debates, trials and even wars ________．

 The policeman kept his eyes________on the screen of the computer to identify the criminal's footprints.