A:①②③
B:②③①
C:③②①
D:③①②
1×9 + 2 =" 11" 12×9 + 3 =" 111" 123×9 + 4 =" 1" 1111 234×9 + 5 =" 11" 11112 345×9 + 6 =" 111" 111
Keep the windows ____ (open), please. It's a little hot in the room.