peace的副词形式是什么

　　Her son was lying peacefully on his back.

　　她儿子正静静地仰面躺着。

　　Except for traffic noise the night passed peacefully.

　　除了交通噪音，那夜安宁地过去了。

　　The older three girls are still slumbering peacefully.

　　稍大些的3个女孩仍在平静地睡着。