One hundred percent to your studies, though it can be lonely and no fun at all, will leave precious marks on your youth.
A. mitment
B. attention
C. reference
D. reaction
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(答案→)A. mitment
B. attention
C. reference
D. reaction
解析：句意：百分百的致力于你的学习，尽管它可能会使你感到孤独和根本没有乐趣，但是它会在你的少年时期留下珍贵的印记。Commitment致力；attention注意力；reference参考；reaction反应，选A。