It may be quite a long time ________ she is back again, so don't be too cross with her.

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________ , he does get angry with his girlfriend at times.

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—Will you go now?

—Not until I ________ my experiments.

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In the office I never seem to have time until after 5:30 p. m., ________ many people have gone home.

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The famous scientist grew up ________ he was born and in 1930 he came to Shanghai.

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The weather turned out to be very good, ________ was more than we could expect.

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He made another wonderful discovery, ________ of great importance to science.

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You can never imagine what great trouble I have had ________ the patient who received a serious wound.

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This is Mr. Smith, ________ I think has something interesting to tell you.

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Last night we went to Jack's birthday party, ________ we enjoyed very much.

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