在正式场合穿拖鞋不合适。

Wearing slippers to a formal event is ___wrong.

我觉得这部电影选错了演员。

I think they chose the ___wrong actors for this movie.

她在大学里与不合适的人群交往，这影响了她的学业。

She got in with the ___wrong crowd at university and it affected her studies.