expansive

这片草原非常开阔，牛群显得很小。

The grassland is ___expansive, making the herd look small.

国家公园拥有广阔的森林和湖泊。

The national park boasts ___expansive forests and lakes.

喝了几杯茶后，她变得异常健谈，分享了许多旅行故事。

After a few cups of tea, she became unusually ___expansive, sharing many travel stories.