假期结束后的第一周总是很难适应返校生活。

The first week after vacation is always hard to adjust to the ___back-to school routine.

他下周一有三个连续的工作面试。

He has three ___back-to-back job interviews next Monday.

他们背靠背站着玩捉迷藏。

They stood ___back-to back playing hide and seek.