她需要在月底前结清信用卡账单。

She needs to ___settle her credit card bill by the end of the month.

为了避免罚款，你应该及时结清账单。

To avoid penalties, you should ___settle your bills promptly.

他在出国前设法还清了所有债务。

He managed to ___settle all his debts before moving abroad.