我拿到两张A牌，凑成了21点。

I drew two aces and made a ___two-one.

他刚满21岁，终于可以合法去酒吧了。

He just turned ___twenty-one and can finally go to bars legally.

他最喜欢的足球明星穿着21号球衣。

His favorite soccer player wears the number ___21 on his jersey.