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A. nine thousand nine thousands nine thousand of nine thousands of
but their teacher cannot hear them and their teacher can hear them, too but cannot hear their schoolmates and see him or her at the same time
nineteen and ninety-nine nineteen ninety-nine one thousand nine hundred and ninety-nine nineteen hundred and ninety-nine
Year Eight; the nine grade the eighth year; Grade Nine Year Eighth; the ninth grade the eight year; Grade Ninth
they live far away from one another they do not like school they are not old enough to go to school their families are too poor
ninth nine the nine the ninth
has been married with married with married to has been married to
not in a classroom but at the homes of the students by speaking only and not showing anything in writing without using any textbooks or pictures without knowing whether the students are attending
always never usually seldom
twelve; nine twelfth; nine twelfth; ninth twelve; ninth
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