假設你是沈陽某中學的七年級學生李華。請你以"保護地球"為主題，為學校宣傳欄寫一封倡議書。
要點如下：
（1）倡議的原因；
（2）倡議的具體內容（如停止污染空氣，停止污染水，減少垃圾；并說明我們應該怎樣做等）；
（3）發出倡議。
注意：
（1）詞數60～80左右，可以適當增加細節，以使行文連貫；
（2）開頭已為你寫好，不計總數。

Dear friends，
    Our Earth is in danger.We must do something to protect it.________
Yours，
Li Hua

【考點】倡議書．

【答案】Dear friends，
    Our Earth is in danger.We must do something to protect it .Pollution is threatening our existence.Our school advocates that we should build a low-carbon life in order to protect the earth.I think it is everyone's duty to work hard to achieve this goal.
Firstly，we should ride bicycles instead of riding in cars or school buses to reduce the amount of pollution.Secondly，when we eat the food in the school cafeteria，we should eat up what we buy and not waste the food.Thirdly，it is
important for us to save electricity and water.We should not leave the lights on in the daytime and leave water running after washing.
Dear fellow students，let's start right now and spare no effort to do every little thing we can from now on!
Yours，
Li Hua