找出下列单词中归类或读音不同于其他单词的一项。
____________ they are brothers, they look like each other.
We will spend our summer holiday in Guilin, but we haven’t decided______________.
— When _________ you________ your teeth, Billy? —Just now.
When I was walking in the street, I saw a plane___________ over my head.
We ___________ when the teacher came in.
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