. New mineral resources may be discovered during the forthcoming Antarctic _____.

I must have been a great _____ to my parents in those hard days, for I never failed to live up to their expectations.

He keeps in the safe $3 million _____ of diamonds.   

---Mary was being badly treated when John happened to pass by and helped her out ---I think it was not a pure______but had been well planned.

I didn’t have to work all weekend — I did it by _______.