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Not until the 17th century did a nation dare to attempt a(n) _________count of its population, due to calculating difficulties.

A number of amateur________ build their own observatories in or near their homes, and they supplement the work of professional observatories with their own equipment.

The celebration of Labour Day, in honour of the working class, was______ in the United States in 1882.

The invention of the printing press set _________ a social revolution that is still in progress.