语音知识考查：找出下列各组单词中划线部分的读音不同于其他三个的单词。
____, I passed the exam at last.
The book cost you 50 yuan, _______?
I want to know the reporter _____ is working for this Daily Paper.
—We can use QQ to talk with each other online. —Really? Could you show me ______it?
—What is your best friend like?. —He is a helpful student. He often helps the teachers _____ papers.
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