No child should be forced to drop out ______ school because his or her parents can’t afford school fees.
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I devote myself heart and soul ______ the arduous task.
She assisted the president to put priority ______ the management of the real estates.
We have renewed our friendly relationship ______ Western countries.
实验中使用的光源是
A. 卤素灯
B. 汞灯
C. 钠光灯
D. 白炽灯
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