钟摆左右摆动。

The pendulum was swinging ___from ___side ___to ___side.

笼中的动物紧张地左右走动。

The caged animal was walking nervously ___from ___side ___to ___side.

他摇头表示不同意。

He shook his head ___from ___side ___to ___side to show disagreement.