The teacher wrote on the Blackboard, SG 2 4 6 8 10 12 14 16 18 20 students of the English language. Ask for volunteers, students coming out, write the number of the missing is 1 3 5 7 9 11 13 15 17 19, students help each of these into English (students, 1-20, and then in the grade 1)
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