如果他不认真学习，就会考试不及格。

If he doesn't study hard, he will ___fail the exam.

他忘记了我们的周年纪念日。

He ___fails to remember our anniversary.

我的手机在关键时刻坏了。

My phone ___fails at the most critical moment.

这款新产品未能达到宣传的效果，让消费者很失望。

The new product ___fails to meet the advertised benefits, disappointing many customers.