我喜欢巧克力，但我只是偶尔吃它。

I love chocolate, but I only eat it ___now ___and ___then.

如果你真的偶尔想吃点零食，试着吃水果和蔬菜，而不是糖果。

If you really love to have a snack ___now ___and ___then, try to eat fruit and vegetables, instead of sweets.

他偶尔喜欢去远足以享受大自然。

He likes to go hiking ___now ___and ___then to enjoy nature.