雨滴轻轻敲打在屋顶上，发出滴滴答答的声音，帮助我入睡。

The ___pitter-patters of raindrops on the roof helped me fall asleep.

小脚丫在地板上啪嗒啪嗒地跑过。

Little feet ___pitter-pattered across the wooden floor.