根据法律，他们必须提供合同。

They have to provide a contract ___by ___law.

根据法律，瑞典的组织和公司被迫提出雇佣更多女性并改善她们条件的计划。

Swedish organisations and companies are forced ___by ___law to put forward programmes for employing more women and improving their conditions.

根据法律，雇主必须确保工作场所安全。

Employers are required ___by ___law to ensure workplace safety.