他的摩托车在寒冷的早晨总是点火不畅。

His motorcycle always ___misfires on cold mornings.

他们的营销策略完全没奏效，反而引起了消费者的反感。

Their marketing campaign completely ___misfired and turned consumers away.

他的计划完全失败了，因为关键环节出了问题。

His plan completely ___misfired because a critical step went wrong.