I would rather choose number 2, the next lecture is math
٣٠ أكتوبر ٢٠١٩
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Thank you.
٣٠ أكتوبر ٢٠١٩
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At least in Canada, "lesson" is all aspects [plan, lecture, student activities, and student homework] of an educational unit, and "lecture" is the explanation given by the teacher.