第1个
开头：dear headmasters,teachers,classmates and friends: i’m very proud that i have chosen to speak to you all today, i’m a bit nervous as i’ve never made a speech before to so many people ,so please forgive me if it shows.
第2个
开头：how to protect the environment? nowadays, more and more people realize it`s necessary and important to protect the environment. also,there are some people who don`t pay attention to hygiene and they can`t stop littering the rubbish casually or spitting everywhere all the time.and in addition, there are a few factories often cutting down the trees, discharging chemicals and dirty water and so on.and it causes many problems like the greenhouse effect.if they do these day by day and our life will be harder and harder,so we have to stop them. to stop them we can put up commonweal advertisements and tell them the detriment of destroying the environment.so we can start from now to make a beautiful life.
第3个
开头：protection of the environment once man did not have to think about the protection of his environment. there were few people on the earth, and natural resources seemed to be unlimited.
第4个
开头：in my opinion, to protect environment, the government must take even more concrete measures. first, it should let people fully realize the importance of environmental protection through education. second, much more efforts should be made to put the population planning policy into practice, because more people means more people means more pollution.
