This is my desk. Two____  are on it. One is my English book, and the other (另一本) is my math book. You can also see (也能看见)____CDs  on the desk. The CDs are ____. My pencil box is on the desk,____. A pen,____  eraser and a ruler ____  in it. The pen is black, the____  is yellow, and the ruler is white.  ____  is my pencil? Aha, it's under the desk. Is my computer game  ____the desk，too? No, it isn't. Where is it? I can't____it in my room.

请按要求作图：

①请在图（1）中画出重物上升，最省力的绕线方法；

②如图（2），木棒在力F的作用下静止，画出力F关于O点的力臂；

③如图（3），请将图中的灯、开关正确连入家庭电路．