In most ways, light helps us see things. But in recent years, because humans are using too much of it, it {#blank#}1{#/blank#}(cause) a kind of pollution. So it is difficult for us to see some of the most wonderful things in the life when we look up{#blank#}2{#/blank#}(watch) the night sky. In general, humans' eyes can see about 2,500 stars {#blank#}3{#/blank#} any special equipment. However, we can only see 200 to 300 stars from today's countryside, and no more than ten stars from a city.

    {#blank#}4{#/blank#}, a study shows that lots of night time light can harm animals too. When birds fly to another place over cities, they sometimes get {#blank#}5{#/blank#}(lose) because of bright light and fly in {#blank#}6{#/blank#}(circle). Sea turtles (海龟) need dark beaches for {#blank#}7{#/blank#} (lay) eggs, but they can't find good places because of bright light.

    In order to prevent things from going {#blank#}8{#/blank#} (bad), governments are working to reduce light pollution. Light is used only when and {#blank#}9{#/blank#} it is really needed. I hope humans and all the animals can live a good life under {#blank#}10{#/blank#} same blue sky again in the near future.