earn money

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i am a student but i urgently want to earn money because i feel ashamed to using my prarents' money. they are so hard to earn enough money to let me go to university.when i see their white hair on the temples,i feel very sorry.but in fact i don't know how to earn money by using after-school time. now i am distressed.can you give me some suggestions?(i am sorry that i am not good at english very well. so if you see any mistakes, please pick them out ,ok? thank you.)