题目内容：

In most situations, light helps us see. But nowadays humans are using so much light that it is in fact a kind of pollution.

When it comes to looking at the night sky, too much light makes it d1.for us to watch some of life’s most wonderful views: stars, planets and even galaxies(星系).

According to scientific research, about 2,500 stars can be seen by the human eye without u2.any special equipment(设备). But because of light pollution, you can only see 200 to 300 stars from today’s countryside, and no more than ten stars from a city. In most big c3., people can’t see the sky filled with stars like they die in their childhood.

Light pollution influences more than just our view of sky. The latest research s4.that lots of nighttime light can harm wildlife too.

When birds fly to a5.place over cities, they sometimes get lost by the brightness and fly in circles u6.they drop from tiredness. Sea turtles need dark beaches for laying eggs, but they can’t find their ideal places because of those bright lights.

Too much light at night m7.even influence human health, but scientists aren’t sure of that. They are still learning more.

In order to prevent things from going w8., governments and some organizations are working to reduce light pollution. Many cities and towns have taken action to reduce the use of lights at night. Lights are used only when and where they are r9. needed.

Hopefully, in the near f10., humans can enjoy the clear and beautiful sky again and all the wildlife will live a peaceful and undisturbed life too.