二十的英文怎么寫(xiě)

　　例句：

　　Twenty-eight is divisible by seven.

　　二十八可以被七整除。

　　It's twenty years since I've seen her.

　　我已經(jīng)二十年沒(méi)見(jiàn)她了。

　　I've been waiting (for) twenty minutes.

　　我等了二十分鐘。