Action, not talk was       she graded her students on．

With time going by, we have come to realize that creativity is _______it takes to keep a nation highly competitive.

The reason _____ so many people are crazy about Gangnum Style is _____ it’s good for bodybuilding, and it brings people a lot of fun.

Steve Jobs once said: “I’m convinced that the only thing _______ kept me going was _______ I loved what I did.”

Part of the reason Charles Dickens loved his own novel, David Copperfield, was ________ it was rather closely modeled on his own life.(2010·北京)