按照以下格式，试着改写句子

Of the guests, only the American notices this or sees the boy place a bowl of milk on the veranda just outside the open doors.→ Of the guests, none except the American notices this or sees the boy place a bowl of milk on the veranda just outside the open doors.

1. Of the students in the class, only one completed the previous night's homework.

2. Of my siblings, only my oldest sister has light-coloured hair.

3. Of all of the classes I am taking this semester, only one is held in the morning.