她根本不在乎别人怎么想。

She ___couldn't ___care ___less what people think.

经理对我们的投诉漠不关心。

The manager ___couldn't ___care ___less about our complaints.

至于期末考试，他根本不在乎复习。

As for the final exam, he ___couldn't ___care ___less about preparing for it.