我们偶尔去海滩。

We do go to the beach ___once ___in ___a ___while.

她除了偶尔说“哦”和“是的，是的”之外，没说太多。

She did not say very much except for "oh" and "yes, yes" ___every ___once ___in ___a ___while.

我偶尔喜欢犒劳自己一顿丰盛的晚餐。

I like to treat myself to a nice dinner ___once ___in ___a ___while.