人们在持续偿还贷款方面遇到困难。

People are having difficulties ___keeping ___up the repayments on their loans.

一个人无家可归的原因是他或她无法支付租金或未能持续支付抵押贷款。

The reason why a person becomes homeless is that he or she is not able to pay the rent or fails to ___keep ___up the mortgage payments.

为了保持健康，你必须坚持规律的锻炼计划。

To maintain good health, you must ___keep ___up a regular exercise routine.