Question

【题目】Jack received many gifts from his friends on his ________ birthday.(twelve)

Answer 1

【答案】twelfth

【解析】

句意：杰克在他十二岁生日那天收到了许多朋友的礼物。

所给单词twelve为基数词“十二”，由空后单数名词birthday，可知此处用twelve的序数词twelfth“第十二”，这里表示Jack的第十二个生日，故答案为twelfth。