题目内容
A considerable amount of time and money has been invested in_______this latest video recorder.
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When the train was pulling out of the station, Elizabeth________her handkerchief from the train window as a goodbye.
I've grown______; I'm totally disillusioned about everyone and everything.
Even when the new system was firmly established, some old ideas and practices______on for a long time.
By now the skies were black, a______wind was blustering down the street and the rain was slashing sideways.
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