学生们正在辩论是否应该延长假期。

The students are ___debating whether holidays should be extended.

学生们正在热烈讨论环境保护的重要性。

The students are ___debating the importance of environmental protection.

他正在考虑要不要买那辆二手车。

He is ___debating whether to buy that used car or not.