A long time ago，trees in forests kept their leaves years round.But one winter，things changed，and would never be the same as before.
   The cold winter winds were blowing，and the birds were flying south except one small bird with a broken wing.
   The little bird came to a huge oak tree（橡樹(shù)）."Please，Mr.Oak，"said the bird."May I take shelter（住所）on your branches for the winter？"
   The oak tree was angry."Move on，bird，" said the oak tree. "I am the king of the forest.I will never accept you to live on my branches."
   And so，the bird came to a white birch tree（白樺樹(shù)）.The birch tree thought he was the prettiest tree on the land.When the little bird asked for shelter，the birch tree said， "Go away from me!I must take care of my beautiful leaves."
   Finally，a pine（松樹(shù)）tree noticed this and said， "I will stand here all winter，little bird.My branches will keep you from the wind.Do not worry.You will be safe with me."
   Later，the cold north wind came to blow in the forest.It blew so hard that it knocked all the leaves from the oak and the birch.It was going to blow the leaves off the pine，too.But its father said no，for he had seen the good work of the tree in helping the bird.
   That's why some trees have no leaves in winter.
（1）One small bird couldn't fly to south because its wing was

broken

broken

.
（2）When the oak tree was angry，he said "

move on

move on

"to the bird.
（3）The birch tree thought he was

the prettiest

the prettiest

on the land.
（4）The wind was stopped from blowing because of

the good work

the good work

of the pine in helping the bird.
（5）From the end of the story，we can know

kindness

kindness

can change something.