Professor Tang didn’t give us a speech today．It was he had a traffic accident on the way to school．
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He smiled politely ________ Mary apologized for her drunken friends.(2012·山东)
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Telephone users sometimes complain about unreliable service and they consider unfair charges.
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They are putting too much carbon dioxide into the atmosphere, ______ prevents heat from escaping from the earth into space.
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Along with the letter was his promise he would visit me the New Year.
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—Would you tell me ____you want your tea, with sugar or milk?—Sugar, please.
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