五、阅读短文，补全句子。
Trees are our friends. They are very useful. They give us wood, so we can make paper, desks and chairs. Many trees give us fruit. We all like eating fruit. It keeps us healthy. Our city looks beautiful with trees. Trees also help keep the air clean.
Trees are important. We should not cut down too many trees. We should protect trees and plant more trees.
1. Trees are our useful .
2. We make paper, desks and chairs with .
3. keeps us healthy.
4. Trees make our city .
5. Trees help keep the air .

六、阅读短文，完成表格。
There are some easy things you can do to protect the Earth.
• Plant flowers, grass and trees.
• Whenever you visit a park or a beach, take away what you take there—keep rubbish in a bag until you can put it in a bin.
• Turn off the lights and TVs when you leave the room.
• Turn off the tap when you brush your teeth. You can save some water.
• Keep the doors and windows closed in winter to keep warm.
• Use both sides of the paper.
• Give your old clothes to poor children in need.
• Never pour dirty water into the rivers or the lakes nearby.
If everyone makes a contribution(贡献) to protecting the environment, the world will become more beautiful.