辨音: 请从A、B、C、D四个选项中找出划线部分的发音与其他三个不同的一项。
_____ great fun it is to make a snowman in winter.
The flight to London wasbecause of the heavy snow.
Tom is weak in physics. He always feels _______ before he takes a physics test.
Ann is a careful girl. She always goes over her exercises to____ there are no mistakes．
To be healthy, one must have at least _____ sleep every day.
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