没有合法有效的理由，你不能被解雇。

You cannot be fired without a ___legally valid reason.

你必须年满18岁才能合法购买酒精饮料。

You must be at least 18 years old to ___legally purchase alcohol.

同性婚姻在全国范围内得到了法律承认。

Same-sex marriage was ___legally recognized nationwide.