我用深色颜料加深了这幅画的阴影部分。

I used dark paint to ___darken the shadows in this painting.

连续阴雨天让她的心情变得忧郁起来。

The continuous rainy days ___darkened her mood.

他含糊不清的解释反而让事情更加难以理解。

His unclear explanation only ___darkened the situation.