Someone says examination can help us go over our lessons in time and after the examination we can find how we are getting on with  our  studies.  But  we  are  always  having  too  many examinations and they are also too difficult for us to get through.I find some of us have lost interest in learning lessons. Besides,it is harmful to our health as we hardly have any time to go in for sports.  I think the present system of measurement should be improved.

　　Water

　　Water is very important to living things.  Without water there can be no life on the earth. All animals and plants need water. Man also needs water. We need water to drink, to cook our food and to clean ourselves.  Water is needed in offices,factories, schools and hospitals.  
      From space the earth looks like a huge water-covered globe.Water covers about seventy percent of the earth's surface. There is water in oceans, seas, rivers, and lakes. Even in the driest part of the world, there is some water in the air. Water is found almost everywhere.

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