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。
Paul is friendly to us.He always___good solutions to our problems.
I have to finish my homework first_____ cleaning up the room.
The Olympic champions_____ all the audience excited at 2004 Olympic Games.
Mr. Zhou was really anxious _____he can’t find his car.
— What would you do if you won the lottery? — I would give it_____ medical research.
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