舒服的副词用英语怎么表达？

　　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.

　　他舒服地斜躺在沙发上看报。

　　Some advice on how to carry backpacks comfortably and safely.

　　一些关于如何舒适安全地背背包的建议。