题目内容
把下面给出的英语单词翻译为汉语：postal code
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把下面给出的英语单词翻译为汉语：return address
Each worker puts in nearly 2,200 hours a year，_ _ _ _average，and contributes about $ 30 to GDP per hour.
If you have difficulty_ _ _ _your bills，tell you utility company as soon as possible.
_ _ _ _most students own a smartphone，the school does not allow them to use it in the classroom.
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