a, school, was, primary, Peter, student, (.)

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【答案】Peter was a primary school student.

【解析】

a一个，school学校，was是，primary初级的，Peter皮特，student学生。根据所给的句号，可知句子是一个陈述句，根据所给词义可以连成句子：皮特是一个小学生。故答案为Peter was a primary school student.