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A teacher guides a learner through choosing the correct time preposition for "I brush my teeth ___ the morning." The learner picks "in," which is correct, and the teacher confirms and records the response.

A teacher guides a learner through choosing the correct time preposition for "I brush my teeth ___ the morning." The learner picks "in," which is correct, and the teacher confirms and records the response.
Ready? Let's read. I brush my teeth in the morning or on the morning? In. Good. Put it in the pile. I brush my teeth in the morning. Nice job.