ferret|ferreted|ferreting

农夫训练雪貂来捕捉谷仓里的老鼠。

The farmer trained his ___ferret to catch rats in the barn.

侦探经过数周的调查终于揭露了真相。

The detective ___ferreted out the truth after weeks of investigation.

他在阁楼里翻箱倒柜地寻找那张老照片。

He was ___ferreting searching through the attic for that old photo.