大脑控制着我们的思维和行为。

The brain controls our thoughts and ___behavior.

老师表扬了他在课堂上良好的行为表现。

The teacher praised his good ___behavior in class.

这台打印机最近总是卡纸，运行很不稳定。

The printer keeps jamming recently; its ___behavior is very unstable.

研究显示，鸟儿在冬季会改变行为以适应寒冷环境。

Research shows that birds change their ___behavior in winter to adapt to the cold environment.