beast

那个大块头轻松举起了汽车轮胎，真是个大力士。

That guy lifted the car tire effortlessly—what a ___beast!

这个数学题真是个难题，我花了两个小时才解出来。

This math problem is a real ___beast—it took me two hours to solve.

他总是欺负弱小，真是个野蛮的畜生。

He always bullies the weak—what a cruel ___beast.