Great changes _______ in his hometown in the last twenty years.

It is known to us that it was suchgreat efforts _____________ all the Chinese athletes had made _________ helpedthem get 51 gold medals in the 2008 Beijing Olympic Games

As a matter of fact，________of people seem to prefer watching games to playing games.

Some of the rubbish, such as wood, paper and iron,_____ away over a long period of time.

He pretended to be a doctor，but ____ he is a cheat