请指出下列单词划线部分发音与其它单词不同的选项。（共5小题，每小题0.5分）
When I left my office，I saw the headmaster________to some students at the school gate．
I________my clothes when the phone rang．
The campers were so tired that they________asleep soon．
I called you several times．but you didn’t________．
It’s raining________．Don’t go out without an umbrella．
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