题目内容
Underground tubes were used in many cities to _______ the transport of mail between post offices and government buildings.
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The _______ air was used to push the capsules from one station to the next.
Translate the underlined word in the sentence "In 1900 Charles Smith, then postmaster general of the United States, wrote that letter."
The new method made ________ possible for the immediate delivery of mail as soon as it arrives in the city.
Those goods need _______ to the customer.
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