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They are busy doing______________ (scientist) experiments.

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The_________________ (produce) of computers has doubled in the last few weeks.

What is the latest_____________(develop)?

When and where will it suit your _________________ (convenient) for our next meeting?

中国新民主主义革命的伟大开端是（）。

A. 辛亥革命
B. 护国战争
C. 五四运动
D. 北伐战争