—He comes from the USA.

— It's hard to       her legs were once broken.

— Many kinds of      in the store near my house are on sale. I want to buy a new bed.

    A little boy loved to play around a tall apple tree every day. Later, when he grew up, he no longer played there.

    One day, the boy came and he looked 1. When the tree knew the boy wanted some toys, she asked the boy to pick up all her 2 to sell. So the boy did it and left.

    Another day, the boy turned into a man and got back, "Come and play with 3 !" the tree was excited and said. "4, I have to build a house to live in," the man said. "You can 5 off my branches to build your house. " So the man did it and left 6.

    One hot summer day, the man came. when the apple tree knew that the man needed a boat to go sailing, she let him 7 her trunk(树干).

    After many years, the man came again. "Sorry, my boy. But the

8 thing left is my dying roots," the tree said. "I just need a place to rest 9 I'm old and tired after all these years," the man said.

    "Come! 10 tree roots are the best place to rest." The man sat down and the tree smiled with tears.

    We all cry for water when we are thirsty. But do you know, in very hot, dry weather, plants also make very low sounds as if they are crying for help?

    You see, in a plant's stem there are several hundred "water pipes" that bring water from soil all the way up to the leaves. When the ground turns dry, it becomes harder and harder for plants to do this.

    On very hot days, plants have to get any water that they can get.

    Scientist Robot Winter has found out that when plants can get no water, their "water pipes" snap(发出声音). When that happens, the whole plant vibrates(振动) a little.

    Robot knows that healthy, well-watered plants are quiet.  He also knows that dry plants are many insects' "favourite" and they often attack(袭击) them. How do the insects know which are healthy plants and which are not? Robot thinks that the insects may hear the plants "crying" and they may come to kill them.

提示：1）树木在保护环境方面的作用：吸收有害气体，是对抗空气污染的主要斗士；

2）树木在我们日常生活中的贡献：很多家具来自于木材，纸张来自于木材；

3）树木面临的问题。

Dear students,

    As we all know trees are very important in our lives. We can't live in the world without trees.

    Thank you very much for your listening.

—Because he thinks it is stupid.

—Yes. They can ________ harmful gases from the air.

—OK. We need more ideas.

—I also want to have a penfriend.