摇椅在门廊上缓缓摇动。

The rocking chair is slowly ___swinging on the porch.

孩子们在秋千上快乐地荡来荡去。

The children were happily ___swinging on the playground swings.

他的情绪一直在快乐和悲伤之间摇摆不定。

His mood keeps ___swinging between happiness and sadness.

派对上的人们随着音乐节奏尽情摇摆。

People at the party were ___swinging to the rhythm of the music.