她决定坚持到最后。

She decided to continue ___until ___the ___bitter ___end.

他们发誓为自由战斗到最后。

They vowed to fight ___till ___the ___bitter ___end for their freedom.

尽管面临挑战，他承诺工作到最后。

Despite the challenges, he promised to work ___to ___the ___bitter ___end.