活动人士呼吁禁止攻击性武器。

The activists ___call ___for a ban on assault weapons.

社区领导人要求立即采取行动应对气候变化。

Community leaders ___call ___for immediate action to address climate change.

工会要求对工作场所安全违规行为进行彻底调查。

The union ___call ___for a thorough investigation into workplace safety violations.