她搓揉肥皂直到手上起了一层厚厚的泡沫。

She rubbed the soap until it formed a thick ___lather in her hands.

考试前他紧张得满头大汗。

He worked himself into a ___lather before the exam.

她先在手上打出泡沫，然后再涂抹到头发上。

She worked up a ___lather in her hands before applying it to her hair.