假定你是李華，你和你的朋友Mike約好了本周六去博物館，但是由于你臨時(shí)要參加"美麗市容，從我做起"（Beautiful city，Start from me）的志愿者活動(dòng)而不能與其同行。請(qǐng)根據(jù)以下要點(diǎn)給他寫(xiě)一封道歉信。
    （1）表達(dá)歉意；
    （2）簡(jiǎn)介志愿者活動(dòng)；
    （3）另約時(shí)間。
    注意：（1）詞數(shù)100左右；（2）可以適當(dāng)增加細(xì)節(jié)，以使行文連貫。

Dear Mike，
                        
Yours，
LI Hua

【考點(diǎn)】提綱作文．

【答案】Dear Mike，
Having signed up for a voluntary activity，I'm terribly sorry for not being able to tour the museum with you this Saturday.Therefore，I' writing to express my sincere apology for the inconvenience caused all of sudden.
As you know，I' ve been waiting for a chance to devote myself to raising public awareness of environmental protection.Consequently，when the opportunity to volunteer came，I seized it without hesitatijye.ai.On that day，all the volunteers will put up posters about how to lead a low-carbon lifestyle and pick up the trash along the roads，which will take a whole day.Considering that，I am afraid that I won't keep my word.It is possible for us to fixed another date when you are available.
Words fail to convey how apologetic I feel and I hope that you can accept my heartfelt and genuine apology.
Yours，
Li Hua