问题补充：
—At the school sports meeting, many students are full of, but I’m always exhausted.
—You’d better take more exercise.
A. strength
B. force
C. energy
D. power
答案：
A. strength
B. force
C. energy
D. power
解析：名词词义辨析。strength: the quality of being strong,力气，主要指“肌肉力量以及物体的承重力或抗拉力”。force: 指“能量的应用”即释放的能量及其冲击力。energy: being full of life and action,指“活力”。power: the ability to do things,指可供使用的能量，如意志力、影响力、控制力。题意：“许多学生精力充沛，而我总是精疲力竭”。full of energy（充满活力）与后文exhausted（精疲力竭的）相对。所以选项C正确。
