题目内容：

根据句意, 用括号内所给单词的适当形式填空。

1.She didn’t mean anything more than that. It’s ________ (simple) than you imagined.

2.Tom’s father was so angry that he punished him for his ________ (careless).

3.I couldn’t understand how someone with so many awards could be ________ (known) to me.

4.It’s dangerous to risk ________(step) out of the door without any protection.