He, a Nobelist, made great ______________ to researching in this area.

I can't say which wine is better—it's a(n)________of personal taste. 

Mo Yan's winning of 2012 Nobel Prize shows the world's________of China" contemporary literature.

The key to our success was having the courage to take on any job and then being creative in our ____ to getting it finished.

She expressed ________to the teachers for helping her pass the College Entrance Examination.