舒服的副詞英語怎么表達？

　　He seated himself comfortably at the foot of the bed.

　　他舒服地坐在床尾。

　　He reclined comfortably on a sofa reading a newspaper.

　　他舒服地斜躺在沙發上看報。

　　Some advice on how to carry backpacks comfortably and safely.

　　一些關于如何舒適安全地背背包的建議。