阳光下你的笑常用句型：it is …… that……强调句型，not only……but also……, 动词不定式，宾语从句，定语从句等等。
为使文章过渡自然，适当运用and, so, but, because等连词。
One possible version:
It was the Environment Protection Day on 5th, July that the members in our Environment Protection Union organized an activity on that day. The activity was very meaningful, we went to the destructor plant to learn how to classify the daily garbage. We were all surprised by millions of tons trash there, and it is hard to classify them. I think we should classify those trash before we throw them away. it is not only protect the environment but aslo make the dispose of rubbish much easier. I think I will classify the trash at home from now on and I will also encourage my family and friends to do it for we have only one earth and we should protect it!
【解析】
