What is implied by the author？
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下列不属于水泥混凝土路面优点的是（）A．有利带动当地建材业发展B．耐久性好C．有利于夜间行车D．节约水泥用量
＿＿＿,a friend of Mrs Black found the watch she had lost two days before．
When the savers want their money back，they_____
Which substance in cigarette cause, cancer？
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