Составить предложения на английском со словами believable, possible, active, balanced, forgettable

I have never seen such an active child.

She has had an unforgettable holiday this month.

My sisters have been irresponsible since childhood.

I have just accomplished this logical task.

He has always been an unbalanced person.

I have just read the book with a believable plot.

I've never thought that there's something impossible for me.