根据法律，他们必须提供合同。

They have to provide a contract ___by ___law.

依法提交这些报告对所有公司都是强制性的。

Filing these reports ___by ___law is mandatory for all companies.

根据新规定，餐馆依法必须显示卡路里含量。

Under the new regulations, restaurants must display calorie counts ___by ___law.