改错
In his twenties, he has become a well-known explorer, visited many new places．
John as well as Tom have worked together with me for about three years here．
Contrast may make something appear more beautiful than it is when is seen alone．
Tom was disappointed that most of the guests left when he arrived at the party．
When I was in Paris, I accepted a lot of help from him．
At present, the birthrate in our country is in control．
The Huaihe River has been serious polluted．Day and night
1．________
millions of tons of waste water is being poured down to it from
2．________
hundreds of factories．The waste water is harmful．At present
3．________
there is no fish in it．The river water cannot be drunk．People in
4．________
either bank have to dig wells to take drinking water．The Huaihe
5．________
River is such dirty and poisonous that people don’t dare to swim
6．________
in it．Something must be done to stopping the pollution．The
7．________
government and the people near the river must try to clear water
8．________
as soon as possible．Now special attention has paid to the
9．________
pollution by the government and more scientists．The pollution
10．________
will be prevented in the near future．
You don’t need to describe her．I met her several times．
It is five years since he has returned home．
He was one of the Chinese scientists who have reached the South Pole．