沙发垫子一坐上去就立刻变得蓬松饱满起来。

The couch cushions ___plumped up instantly when she sat down.

她疲惫地走进房间，重重地坐在沙发上。

She walked into the room tiredly and ___plumped down on the sofa.

他犹豫了一会儿，最终果断选择了蓝色的那辆车。

After some hesitation, he finally ___plumped for the blue car.