题目内容
The _______ air was used to push the capsules from one station to the next.
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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.
It takes only a few seconds _______and buy something from an online store.
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