Earth Hour started in 2007 in Sydney，Australia.In that year，2.2 million people（1）

turned

turned

（turn） lights off for one hour.They did this because they cared about our planet.After that，people （2）

from

from

all over the world do the same on the last Saturday of March every year.Now more and more people （3）

are joining

are joining

（join） Earth Hour.
   In fact，Earth Hour is not just to save energy for one hour.It also shows we can （4）

make

make

（make） a difference to our planet.On that day，there are many （5）

things

things

（thing） to do.
   ☆Make sure we switch off all the lights inside （6）

and

and

outside our houses at 8：30 pm.
   ☆Host an Earth Hour party to welcome friends for （7）

an

an

evening conversation.
   ☆Plan some fun games to enjoy （8）

ourselves

ourselves

（we） in the dark.
   ☆Take a walk in the park and enjoy the （9）

beauty

beauty

（beautiful ） of the moonlight.
   ☆ Have a picnic in the evening with your children by candlelight.
   （10）

Finally

Finally

（final），remember that Earth Hour is just one step to help our planet.If we all work together to do more，our planet will have a better future.