所有公司都必须遵守ADA的规定，为残疾员工提供合理的便利。

All companies must follow the ___ADA regulations to provide reasonable accommodations for employees with disabilities.

美国残疾人协会在听证会上提出了关键问题。

The ___ADA raised crucial questions during the hearing.

他最近获得了美国牙科协会的认证。

He recently received certification from the ___ADA.