She is the only one of the girls in our class ________ football.

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The house ________ he once lived in serves as a classroom building now.

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I'll never forget the day ________ I joined the Party.

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Our new teaching building was finished before the day ________ it had been promised to finish.

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He never talks about the things ________ he has experienced (经历) before.

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I must make up the lesson ________ I missed last week.

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_________ that mistake once，I shall not make the same mistake again．

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An army spokesman stressed that all the soldiers had been ordered _________ clear warnings before firing any shots．

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I can think of many cases ___________ students obviously knew a lot of English words and expressions but couldn't write a good essay．

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Although our life is _______, there is no limit ________ serving the people.

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