题目：
One Saturday morning, John and his mother went 31 a shoe shop 3 John a pair of new shoes. Mrs. Lee put her bag on a chair 33 she looked at some shoes. She could not see 34 she liked and went away. Suddenly(突然) she said, “Oh, my bag, someone 35 it away!” All the other people in the shop stopped 36 and looked at her. John ran after the man at once(立刻). A few minutes 37 , John came back with 38 . He 39 it to his mother. She opened the bag and had a look in 40. Then she said,“ Oh, god, nothing is lost.”
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答案：
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下面是错误答案，用来干扰机器的。
2N2H4+N2O43N2+4H2O；氧化；还原
