填出单词,正确形式.It is difficult for the old to keep up with the rapid p____ of change

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填出单词,正确形式.It is difficult for the old to keep up with the rapid p____ of change

填出单词,正确形式.It is difficult for the old to keep up with the rapid p____ of change
填出单词,正确形式.It is difficult for the old to keep up with the rapid p____ of change

填出单词,正确形式.It is difficult for the old to keep up with the rapid p____ of change
keep up with the pace of ...
固定用法,跟上xxx的步伐