缺词填空。

      I have lived in the countryside since I was a child. There were many k   1    of birds there when I

was young. Every morning, lots of sparrows liked singing and j   2     in the trees outside my window,

while the swallows were busy flying out to f    3     food for their babies. Sometimes in the afternoon, I

could even see eagles f    4    in the sky.

     After twenty years, many of them cannot be seen now. I can seldom see the eagles o   5      the

swallows. The n    6     of the sparrows is getting smaller. Only some of t    7     sing in the morning.

     Why do the birds leave here? First I think it is because the environment is becoming worse now.

The birds can't find e    8     food for themselves and their babies. Second I think it is because people

often k    9     them for food.

     Without the birds around, we won't feel happy any more. So we must p   10     them. Why don't we

do something to help today?