要想在政治上成功，你必须坚强。

You have to be ___tough to be successful in politics.

这是关于一位来自古巴的坚强老渔民，他独自乘小船出海捕鱼。

It is about a ___tough old fisherman from Cuba who sails out alone in a small boat to fish.

在整个危机中，她始终保持坚强，从不示弱。

She remained ___tough throughout the crisis, never showing fear.