他因为操作机器不当而受伤了。

He got injured because he operated the machine ___improperly.

他在婚礼上穿着不得体，显得格格不入。

He was dressed ___improperly for the wedding and looked out of place.

他在公共场合举止不当，引起了人们的反感。

He acted ___improperly in public, which upset many people.