Our earth is in trouble． Our drinking water is becoming dirtier and the air is not as clean as before． People and factories are polluting the air， rivers， lakes and seas． You may think there is nothing you can do to help． That's not true． （1） 　　

Cars burn oil．（2） 　　Some people believe that too much CO2 is making the earth warmer than ever．（3） 　　This can save some oil and produce less CO2．

（4） 　　So turn off the air conditioner（空调） when you don't need to use it． Use lights that save energy． Use fewer things that cannot be used again． When you buy something． consider those made from things that can be used again first．

A lot of water is needed for a shower． So take shorter showers．（5） 　　

Every small action can make a big difference to our earth． Let's take action to protect it

A． This can cut the use of water．

B． Air pollution is very serious．

C． This will make a lot of CO2 into the air．

D． So try to walk， ride a bike or take a bus．

E． Nobody can play a role in protecting the earth．

F． There are many things you can do to save the earth．

G． The biggest energy use a home is for keeping warm or cool．