It was not until he got to the office ________ he remembered ________ the key at home.

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The headmaster hurried to the concert hall only ________ the speaker ________ .

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Long, long ago, there was an old man ________ in the cave.

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She is in her room ________ letters.

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The story she told me the other day sounded ________.

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The students stood under the tree, ________.

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________, his heroic deeds were passed on from one person to another.

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This music ________ from one generation to another.

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Speak slowly ________ everyone can catch you.

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单词辨音

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