问题补充：
Jim spends about 2 hours homework, so he has only half an hour his hobbies every day.
A. for; of
B. on; with
C. on; for
D. in; for
答案：
A. for; of
B. on; with
C. on; for
D. in; for
解析：for为了，对于；of关于，……的；on在某方面；with带有，伴随，和；in在某个范围。句意：吉姆花了２个小时做作业，因此每天他只有半个小时来进行他的爱好。结合语境可知前一空表示在某个方面，下一空表示目的对象，故选Ｃ。
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