她的情绪多变，前一秒还开心，下一秒就可能生气。

Her mood is quite ___changeable, happy one moment and angry the next.

这个软件的用户界面可以根据个人喜好调整。

The software's user interface is ___changeable according to personal preferences.

他的情绪变化无常，一会儿高兴一会儿生气。

His ___changeable moods swing from happy to angry in minutes.