Definition: to become tired or to make someone become tired Level: C2
在马拉松的最后几英里，他的速度慢了下来，因为他开始感到疲劳了。
During the final miles of the marathon, his pace slowed as he began to ___tire.
这个要求苛刻的项目让我筋疲力尽。
This demanding project has completely ___tired me ___out.
老师变换了上课方式，以免让学生们感到疲倦。
The teacher varied her lessons so as not to ___tire her students.
