当争吵升级时，邻居不得不介入调解。

The neighbor had to ___step in when the argument escalated.

她轻松地穿上拖鞋去浴室。

She easily ___stepped into her slippers to go to the bathroom.

这种连体裤是带拉链的，可以直接套上穿。

These ___step-in overalls have a zipper so you can just slide into them.