问题描述：
填空 In bigger post office,this work __________________ (do) by machines.After that,the letters _
In bigger post office,this work __________________ (do) by machines.After that,the letters ___________________ (put) into bags and ________________ (give) to other postmen for delivering to our homes.
In bigger post office,this work __________________ (do) by machines.After that,the letters ___________________ (put) into bags and ________________ (give) to other postmen for delivering to our homes.
问题解答：
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