（11·漳州）用形状和大小相同的黑色棋子按下图所示的方式排列，按照这样的规律，第n个图形需要棋子_ ▲ 枚．（用含n的代数式表示）
Mr．Smith （亲吻）his wife and kids before he goes to work every day．
Liu Chuanjian is considered a （英雄）because he safely landed the damaged plane．
Who is （敲）at the door？
Maybe it's the postman．
I can't hear you （清楚地）． Please speak a little bit louder．
I met a friend of （她的）in the street yesterday．
粤公网安备 44130202000953号