他重重地把书包扔在椅子上。

He ___plunks his backpack onto the chair.

他懒散地拨弄着尤克里里，弹得断断续续的。

He lazily ___plunks at the ukulele, playing broken notes.

硬币从口袋里掉出来，啪嗒一声落在地上。

The coin ___plunks onto the floor as it falls out of the pocket.