根据所给的中文补全下列英语句子,每空一词.

问题描述:

根据所给的中文补全下列英语句子,每空一词.
之后它们被涂成了黄色,以便在远处能被很容易地看见.They were later painted yellow ____ ____they could be seem more easily from far away.

so that/