You must return the book in fifteen days.

　　你必須在十五天內歸還書籍。

　　I have fourteen roosters and fifteen hens.

　　我有十四只公雞和十五只母雞。

　　There are fifteen boys and nineteen girls.

　　男生有十五位，女生有十九位。

　　He did this sixteen times.

　　他這樣做了十六次。

　　I have sixteen turkeys.

　　我有十六只火雞。

　　I'm sixteen, after all.

　　畢竟我十六歲了。

　　Jenny is seventeen years old.

　　珍妮17歲。

　　He had confessed to seventeen murders.

　　他已供認了17項謀殺罪。

　　Nora thought he was seventeen years old.

　　諾拉覺得他有17歲。