If you couldn't keep the ______(appoint),please inform us as early as possible.
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There is something wrong with the printer, and I'll have it _______(repair).
The project turned out to be _____(easy)than we though because we had support of many people.
You should read this manual _______(careful) before you start to use the device.
（）是中医养生学的奠基时期。
A. 远古时期
B. 先秦时期
C. 秦汉时期
D. 春秋时期
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