这条裙子的下摆有点松了，需要重新缝一下。

The ___hem of this skirt is loose and needs to be stitched again.

高墙将这座古老的城堡紧紧围住。

The tall walls ___hemmed in the ancient castle.

她轻咳了一声，试图引起老师的注意。

She gave a small ___ahem to get the teacher's attention.