1.Some measures must be taken to control the polution of water.
2.Now the way that we use to extract the material from gaebage and use it has already been found.
3.The meeting should be put off to Monday by others' suggestion.
4As is known to us all,natural light is made up of many kinds of colors.
5Another middle school is built up nowadays.
61200 people were saved by the army in the earthquake.
7The area of Huabei was attacked by a surprising rainstorm,which caused terrible disaster of water.
1.measures must be taken to control water pollution.
2.the methods for abstracting and using those materials from rabish have been found out.
3.It is sugessted that rhe meeting shall be postponded to Monday.
4. It is well known that the natural light is conposed of many colours.
5.Another senior high school has been established in our District.
6.About 1200 people have been rescured by the sodiers in this earthquake.
7.The north china area has been attacked by an unexpected heavy rain and terrible flood was the result thereof.