Unfortunately,what the research center spent five years doing had no _______________(实际的)use.
It never occurred to me to _________(利用)him.
She _________(厌倦)her job, so she has decided to give it up.
Now he is crazy about pop music, so his interest in computer games is in d _________.
Everybody knows that our Chinese teacher is very d _________ to literature.
The United Kingdom c _________ of Great Britain and Northern Ireland.