第一no one wants to live in a city with a great multitude of rubish.smell the rubish give out can pollute the air.rubish in the river can pollute the water.and no matter the polluted air or the polluted water,both are tend to do harm to our citizens’health.so,as we relize the disadvandages of rubish,we ought to take action to deal with the rubish.for some rubish,it should be sorted out so that it would be convenient to do the next step,recycling.for the others,the harm rubish,it should be put into the soil.after that,polluted water must be dealed with.as we know,it's wise for us to prevent the pollution than to deal with the pollution.so effetive measures must be made to prevent the pollution.as much as we try our best to stick to controling the pollution of rubish,we would compose a harmonious music in our society.第二 The value of time A proverb says,"Time is money." But in my opinion,time is even more precious than money.Why?Because when money is spent,we can earn it back.However,when time is gone,it will never return.This is the reason why we must value time.It goes without saying that the time for our study and work is unusually limited.Hence,even an hour is extremely precious.We should make full use of our time to do useful things.As a student,I must make efforts to engage in my study so as to serve our nation and people in the future.But it is a pity that there.are a lot of people who do not know the importance of time.They do not realize that wasting time is equal to wasting a part of their valuable life.In a word,we should form the good habit of saving time.Do not put off what can be done today till tomorrow.Laziness will not only bring us failure but also lead us to the road of poverty.第三In life ,we can hardly do without friends.When we can't solve any problem by ourselves,we need friends.When we have a friend ,we can share happiness and sadness together.In fact,not all the people can help you when you're in trouble.There's a saying "A friend in need is a friend indeed".I think a frined of mine should be like that.When i need him,he won't leave me.Sometimes he will give up the profits to help me Although that is difficult.When you are confused,encourage you to choose the right way.All the peopli need a friend that who is indeed.第四In mine class and grade,has the sincere friendship,has clear showing loving concern,has the guidance earnestly .I love my class,because that is “the paradise which loves”.in here,not only has our common friendship,but also has our teacher to excite the emotions.In teacher's eye we are not only he (she) student,he (she) the friend,in our student's eye,is also so.In our class is the teachers and students,under the class is the friend.in this harmonious big family,has compared to a dear ones thicker sentiment,has compared to dear ones more loves.In here,not lonely,not sad,has not felt inferior,only then happy,happy,happy .Because everybody are offering,is showing loving concern 第五Each and every one of us is responsible for the greenhouse gases we emit in our daily actions and choices.Therefore,combating climate change is going to take the combined efforts of everyone on the planet.The average household carbon footprint in China is 2.41 tons of carbon dioxide annually.That's enough to fill half an Olympic swimming pool.Surprised?Well,here's how you can work to reduce it:1.Get started by calculating your own carbon footprint.This will give you a starting point from which to begin monitoring your progress.You enter details such as what sort of apartment you live in,your personal energy use and travel habits.2.Each week,choose one day when you don't eat meat.Meat uses up lots of energy because it takes a long time to produce.Animals produce methane,which is another dangerous greenhouse gas,when they burp and fart.3.Only buy the amount of food you need and if there are leftovers,get creative.For instance,make them into a soup.Ask to take food home from restaurants if there's some left,but remember to take your own container to avoid using a disposable carton