Find the word which is different from the other three according to the underlined sounds. (找出每组划线部分发音与其他三个不同的单词)
His sister has a bad cough, ____________ she?
He has a hard time the problem.
We are friendly ______our new classmates.
Could I look at your picture? --Yes, of course you ______.
Can you tell me ________ at that time?
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