根据句意，用所给单词的适当形式填空。
We can’t do anything in the ________________ (dark) without light.
Lucy tries her best but did ________________ (bad) among all the members in the team.
Nancy’s brother taught ________________ (he) how to cook.
Tom is a ________________ (honest) boy. We don’t like him.
He is ________________ (terrible) ill, we must send him to hospital at once.