Except a few spelling mistakes your composition is good.Except----Except for

问题补充：

Except a few spelling mistakes, your composition is good.Except----Except for

答案：

(答案→)Except----Except for

解析：except 表示同类之间的比较，不可放在句首; except for 表示不同类之间的比较，或整体与个体的比较，可放在句首.