问题补充：
32. —Mom, I can’t see any point in working hard at all the subjects at school.
— Come on, dear. Years of hard work will surely in the future of your career.
A. make sure
B. pay off
C. bring back
D. pay back
答案：
A. make sure
(答案→)B. pay off
C. bring back
D. pay back
解析：本题考查动词短语，这里的pay off 解释为“有报偿、有回报”。
