她在演示期间试图讲的笑话没能逗笑大家。

Her attempts at humor during the presentation ___fell ___flat.

公司的新营销活动完全没有引起目标受众的兴趣。

The company's new marketing campaign completely ___fell ___flat with its target audience.

尽管精心策划，这出戏的首演之夜反响平平。

Despite careful planning, the opening night of the play ___fell ___flat.