那晚我们睡得很舒服。

We slept very ___comfortably that night.

我正舒服地坐在沙发上看电视，突然所有的灯都灭了，一切都变得寂静。

I was sitting ___comfortably on the couch watching TV when suddenly all the lights went out, [and] everything became silent.

他舒服地靠在椅子上。

He leaned back ___comfortably in his chair.