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BE oF grEAt usEFul

Cell phones are very useful and they're great fun.But cell phones do have risks.If you have one,it is necessary to understand these risks,and learn __11__ enjoy your phone safely.__12__ can be a wonderful way to keep in touch...

Inventions We knew there had been many inventions last century,for example,telephone,phonograph,airplane,computer and so on.What’s the most useful invention?I think the most usuful invention should be telephone.With invention o...

I am a very useful river. I am a river of great use.

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