我偶尔去看望我的祖父母，和他们聊聊近况。

I visit my grandparents ___once ___in ___a ___while to catch up with them.

他只在团队讨论中偶尔发言。

He only speaks up ___every ___once ___in ___a ___while during team discussions.

我们偶尔喜欢尝试新餐馆，探索不同的美食。

We like to try new restaurants ___once ___in ___a ___while to explore different cuisines.