在“探究凸透镜成像的规律”实验中，某同学的实验如图甲所示：

     We make traffic rules to keep order on the roads. These rules also help keep us 1  on the roads.
People have to  2  many traffic rules. In China, you must walk  3  the sidewalk or on the side of the road. Look carefully (仔细地) before you   4  the street.
      If you are riding a bike, don't ride in the middle (中间) of the roads or run through (通过) the road when the traffic light is   5 . When you ride a bike  6  a friend, don't look around and talk.
     If you drive, you must slow down at the traffic lights. You must always  7  a seat belt安全带). Without (没有) belts, 8 the driver and the other people in the car may hurt themselves when the car stops suddenly (突然地).
     When you take a bus, you must be 9 . Get on or get off a bus only when it comes to a  10  When it's full (满的), you shouldn't get on it or you may fall down.

你独自在家时有人敲门，来人自称是你家装修过的工人，有工具落在你家，要你开门取走工具，这时你应（    ）

空调机的遥控器是通过发射____ （选填“紫外线”、“红外线”或“可见光”）来实现对空调机的控制．空调机工作时要消耗电能，电能属于____ （选填“一次”或“二次”）能源．