喝了一杯咖啡后，他立刻精神起来了。

After a cup of coffee, he ___perked up immediately.

弹性工作时间是这家公司的一大福利。

Flexible working hours are one of the best ___perks at this company.

小猫听到开门声立刻竖起了耳朵。

The kitten ___perked up its ears at the sound of the door opening.