那个童话故事里有一个住在山洞里的可怕怪物。

The fairy tale features a scary ___monster living in a cave.

那个凶手是个冷血怪物，毫无人性。

The murderer was a heartless ___monster with no humanity.

那艘货轮是个钢铁巨兽，能运载上千个集装箱。

The cargo ship is a ___monster of steel, capable of carrying thousands of containers.

他在数学竞赛中是个怪物般的存在，总能解决最难的题目。

He's a ___monster in math competitions, always solving the toughest problems.