Indicate the error. (10 - 11)
১০) Sooner or later, all lakes are influence by eutrophication, a process in which lake sediment lowers the depth of the water and drains oxygen from it.

He became rich overnight. What part of speech is 'overnight'?

The nightingale is a singing bird. In this singing is a/an --

I Came home after the rain -----.

The Doctor took the round in the hospital. Here 'round' is a/an ---

Alumni is the plural from of