那位老人在公园里散步时，来回摆动着他的手杖。

The old man ___swung his walking stick as he strolled through the park.

灯笼在晚风中轻轻地来回摆动。

The lantern was ___swinging gently in the evening breeze.

孩子们喜欢在游乐场的秋千上荡来荡去。

The children love to ___swing on the playground swings.