slump|slumped|slumping

公司销售额连续三个月下滑，陷入了严重的不景气期。

The company's sales have been declining for three months straight, stuck in a serious ___slump.

由于经济衰退，房价急剧下跌了15%。

Housing prices ___slumped by 15% due to the economic downturn.

疲惫的学生在课桌上无精打采地趴着。

The tired student was ___slumping over his desk.