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零食，试着吃水果和蔬菜，而不是甜食。

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

我们周末偶尔去远足。

We go hiking ___now ___and ___then on weekends.