酒店大堂里，办理入住和退房的客人熙熙攘攘。

The hotel ___lobby was bustling with guests checking in and out.

请在办公楼的大堂等我。

Please wait for me in the office building's ___lobby.

我们约定在演出开始前在剧院大堂见面。

We agreed to meet in the theater ___lobby before the show started.