Using coordination:
Every boy was asked to help when the fire broke out. Every girl was asked to help when the fire broke out.
【正确答案】：Every boy and every girl was asked to help when the fire broke out.
【题目解析】：在each…and each，every…and every，no…and no，many a…and many a等and连接并列单数主语的结构中，谓语动词用单数。
