根据联邦法律，公司必须为全职员工提供健康保险。

Under federal law, companies ___are ___obliged ___to provide health insurance to full-time employees.

在一些国家，年轻人必须服兵役一段时间。

In some countries, young people ___are ___obliged ___to serve in the military for a period.

作为租赁的一部分，租户有义务保持房产清洁无损。

As part of the lease, tenants ___are ___obliged ___to keep the property clean and undamaged.