雨水慢慢渗入土壤。

Rainwater ___percolates slowly into the soil.

这个新政策的消息逐渐在小镇上传播开来。

The news of the new policy slowly ___percolated throughout the small town.

随着比赛临近，校园里的热情开始高涨起来。

Excitement started to ___percolate through the campus as the game day drew near.