老人看到账单时，发出了不满的呻吟声。

The old man ___groaned with disapproval when he saw the bill.

当他看到一大堆工作时，不禁呻吟起来。

He ___groaned when he saw the pile of work.

满载货物的卡车驶过时，这座老桥发出吱嘎声。

The old bridge ___groaned as the heavily loaded truck drove across it.