The reason _________ the little actress has been such a success is ________ she is both clever and hardworking.

His explanation was so confusing that I could hardly make anyof it at all.

I saw some boys football when I walked past the hall.

下列各句中划线词活用类型完全一致的一项是（ ）

英语字母共有 个，其中元音字母有 个。