1.There is no doubt that China have played a more and more important role in international affairs.
2.Doctors always warned us that vitamin pills can't be the subtitute of balanced diet.
3.So far,many parts of the people still hadve not realized the harm of the air pollution .
4.He went to the book fair ang picked up many books of specials plice.
5.The fire fighter who rushed to the burnning house to save the twins sacrificed.
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