She looked at the pretty vase I bought at the market and said it was a real _____.

Scientists are hoping for a _____ in the search for a cure for cancer. 

One hundred percent _______ to your studies, though it can be lonely and no fun at all, will leave precious marks on your youth.

To her ________，the salesgirl still helps that old lady.

--- Believe it or not, last month in America I came across the girl whose photo was in the drift bottle I had got 3 years before. --- Really? That’s the most surprising ___________________ I’ve ever heard of.