— Attention, please. The plane has to be _________ because of the foggy weather.— Oh, bad luck! We have to wait now.
A.怎么 B.什么
①大海里面有____?
②碰到不认识的字,我们____办?
③乌鸦为____这样聪明呢?
原鸡进化成了不同品种的鸡是( )