People ____ (learn) to read thanks to printed books., learned, They _______ (test) new printing methods., tested, Printers _____ (not work) at night., did not work, did not, People _______ (not order) many books at first., did not order, did not, Workers ______ (clean) the machines every day., cleaned, People ______ (print) books for education., printed, The first presses _______ (not produce) many books per day., did not produce, did not.

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