缺词填空。
I have lived in the countryside since I was a child. There were manyk   1    of birds there when I
was young. Every morning, lots of sparrows liked singing andj   2    in the trees outside my window,
while the swallows were busy flying out tof    3    food for their babies. Sometimes in the afternoon, I
could even see eaglesf    4    in the sky.
After twenty years, many of them cannot be seen now. I can seldom see the eagleso   5     the
swallows. Then    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 finde    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 mustp   10    them. Why don't we
do something to help today?

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