他以健康为由辞职了。

He resigned on medical ___grounds.

公司以种族理由解雇了他，这引发了一场巨大的争议。

The company dismissed him on racial ___grounds, which sparked a major controversy.

法院以证据不足为由撤销了定罪。

The court overturned the conviction on the ___grounds of insufficient evidence.