你偶尔会遇到一些非常有趣的人。

You meet some really interesting people ___every ___once ___in ___a ___while.

他偶尔会进城购买补给品。

He went into town ___every ___so ___often to buy supplies.

同样，常识告诉我们，只要我们不常吃，西班牙橙子比佛罗里达橙子多含0.01%的维生素C并不重要。

And likewise, common sense tells us it doesn't matter that oranges from Spain contain 0.01% more vitamin C than those from Florida, as long as we eat them ___every ___once ___in ___a ___while.