对于长途步行来说，平底鞋是最舒适的。

For long walks, ___flat ___shoes are the most comfortable.

她更喜欢平底鞋，因为日常穿着更舒适。

She prefers ___flat ___shoes because they are more comfortable for daily wear.

这双黑色平底鞋几乎可以搭配任何服装。

These black ___flat ___shoes match almost any outfit.