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

 I'd like to start my own business—that's ________ I'd do if I had the money.(2011·江西)

Although he has become wealthy, Mr. Wood remains           he used to be, modest and friendly.

—We were surprised to hear that the reason_______ she gave for her absence was______ her mother was ill.—Yes，we saw her mother was at the supermarket that morning.

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