______ the secret of nature, the young scientist has little time for entertainment.
Whoever invented______ wheel is believed to have made______ most useful invention in______ history.
_____ you are alone at home, why don’t you go downtown with your friends?
He has _____ little education that he finds it impossible for him to be equal to ____ important a task.
There was plenty of time. She ____ to the station.
The student had no choice but _____ his teacher ____ the mistake he had made.