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It was not ________ he took off his eyeglasses that I recognized him．

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I waited ________ he came back．

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I haven’t seen him ________ he moved to the other side of the town．

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________ the work was done, we sat down to sum up experience．

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He had learned Chinese ________ he came to China．

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I listen to the recorder ________ I have time．

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Henry is in charge of the office ________ Mr．Smith is away．

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He learned to speak German ________ he was in Berlin．

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We’ll go to the country at the beginning of June, ________ the summer harvest will start．

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I was about to go out ________ a visitor came．