他空洞的眼神暴露了内心的空虚。

His blank stare revealed the ___vacuity of his mind.

这个废弃的仓库如今只是一个空荡荡的空间。

The deserted warehouse is now just a large ___vacuity.

演讲中充斥着空洞无物的陈词滥调。

The speech was full of meaningless ___vacuity and cliches.