我昨天顺路去图书馆看了看新书。

I made a ___drop-in at the library yesterday to check out new books.

健身房的教练说欢迎任何临时来锻炼的人。

The gym trainer said ___drop-ins are welcome to use the facilities.

这家咖啡店提供无需预约的临时座位区。

This cafe has a ___drop-in seating area for casual visitors.