根据英语提示完成句子
They are celebrating their daughter's(twenty-one)birthday in the Garden Hotel.
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根据 They are celebrating their daughter's _____(twenty-one)birthday in the Garden Hotel. 可知他们在花园酒店庆祝女儿第二十一岁生日。这里表示第几个生日应该用序数词 twenty-one 的序数词是 twenty-first,故填 twenty-first。