preoccupation|preoccupations

考试结果成了她最近唯一的牵挂。

The exam results have become her main ___preoccupation lately.

他最近的主要关注点是如何提高工作效率。

His main ___preoccupations lately are how to improve work efficiency.

他对游戏的沉迷影响了他的学习成绩。

His ___preoccupation with video games affected his school performance.