PAPER WAS EXPENSIVE DURING THE MIDDLE AGES THAT IT HAD TO BE USED S...

Lớp 10 Tiếng Anh Đề thi tuyển sinh vào lớp 10 môn Tiếng Anh năm 2013-2014 - Sở GD&ĐT TP Hồ Chí Minh

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6. Paper was expensive during the Middle Ages that it had to be used sparingly. => so expensive