题目内容
Thanks to the ________ of air transport, everyone is free to go anywhere at any time.
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Mary was a careful speaker; every word seemed to have been ________ before it was allowed to escape through her lips.
The wedding ceremony of my sister was a very ________ experience for our family.
The local government is pressed to find new places to ________ waste.
The new system designed to ________ harmful emissions (排放物) from factories will be put into use soon.
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