听下面一段独白，回答小题。
（1）What do people use more and more according to the talk？
A. Light.
B. Heat
C. Electricity.
（2）What do many of us often do as soon as we come back home at night？
A. Turn on the TV.
B. Turn on all the lights.
C. Turn on the air conditioner.
（3）Which problem is becoming an important one according to the talk？
A. How to save electricity.
B. How to use electricity.
C. How to use electricity safely.