_______ the secret of nature, the young scientist has little time for entertainment.
Is there a supermarket around _____ I can buy some Christmas gifts?
—How was your National Day vacation? —Great! We went sightseeing and spent the _____ days at home.
It is unsafe for you to stay here.Please leave this place _____.
A woman had a _____ escape yesterday when her car left the road.
He said that doing part-time jobs did no good to students, but few his view.