她强烈的情绪使她的思维变得混乱不清。

Her strong emotions were ___clouding her ability to think clearly.

窗户上的雾气让外面的景色变得模糊不清。

The fog on the window was ___clouding the view outside.

天空开始多云，看起来要变天了。

The sky is ___clouding over; it looks like the weather is changing.