从方框中选出合适的句子，填在短文的空缺处。
Electricity is an important part in our life. We can't see or touch it, but it is all around us. But some people don't know that everyone should save electricity. When it is not completely dark, many street lamps (路灯) light up early in some streets of places. Some people are sleeping with the lights on. They are all wrong. Here I make some suggestions about stopping these things.
1. We light them from 7:00 p.m.—5:30 a.m. in summer, and from 5:30 p.m.—6:00 a.m. in winter.
2. If some small areas are very dark, just turn on a few lights.
3. The distance (距离) between street lamps can be 50—60 meters.
4. If there are some activities, we can make the lights bright; if there is no activity, lights needn't be too bright.
5. Ask people to save electricity through TV shows, newspapers, and so on.
Electricity is a valuable resource (资源). It helps us live well and conveniently.
A. Our life will be terrible without electricity.
B. It can save electricity and money.
C. Turn on the street lamps on time.
D. Some people don't turn off the lights when they leave the room.
E. We should take action to save it at once!