单项选择题
A.situations B.directions C.chances D.dangers
A.they prefer to have more children B.the elderly like living with their children C.the middle-aged couples have different care giving duties D.the average age for American couples to have children is 40
A.Text an apology to the caller. B.Call back if it is from abroad. C.Wait till the caller calls again. D.Return the call as early as one can.