晚上，爸爸让姐姐给我发的新书包书皮，可姐姐不愿意。爸爸就说：包书皮有奖励，包一本书3元钱。姐姐二话不说，马上拿起书包起来。一会儿功夫，5本书全包完了，爸爸给了她15元钱。等我 学会了包书皮，也要给爸爸要奖励。

　　In the evening, my father asked my sister to send me a new bag cover, but my sister didn't want to. Dad said: there is a reward for the book cover, 3 yuan for a book. Sister said nothing, immediately picked up the bag. After a while, five books were all packed, and her father gave her 15 yuan. When I learned how to pack book covers, I also wanted to reward my father.

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