当她看到账单时，忍不住发出了一声呻吟。

She let out a loud ___groan when she saw the bill.

听到明天要加班的消息，办公室里一片叹气声。

The office filled with ___groans when they heard about working overtime tomorrow.

沉重的箱子放上去时，木楼梯发出吱呀声。

The wooden stairs ___groaned as the heavy boxes were placed on them.