她哼唱着她最喜欢的曲子。

She ___hummed her favorite tune.

她一边做饭一边哼着最喜欢的歌。

She ___hummed her favorite song while cooking.

电扇在角落里轻声嗡嗡作响。

The electric fan ___hummed softly in the corner.

商场在周末总是热闹非凡。

The mall always ___hummed with crowds on weekends.