There’s a ________ in our office that when it’s somebody’s birthday，they bring in a cake for us all to share.                                                (2011·山东，34)

It is reported that the United States uses ______ energy as the whole of Europe.

--Do you know when the Chinese custom_________ from? --It's hard to say. But its characteristics__________ the Tang Period.

A few years after his graduation from a university, the man acquired the    of being a philosopher. 

It is a spectacular __________ as the fireworks are set off and light up the sky during the Spring Festival.