问题:

听短文,给下列句子排序。短文读两遍。 A. You need to work hard and never give up.
B. You have to think carefully.
C. You will make your invention work.
D. You have to make a good plan and make sure that there is need for your invention.
E. You must study hard.
1._____ 2._____ 3._____ 4._____ 5._____

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