The Great Wall istourist attraction that millions of people pour in every year.
so a well-known
a so well-known
such well-known
such a well-known
The __________ conclusion is not a set one. It still needs further testing.
People are _________the use of alternative energy sources. Because the fossil fuels _________will be used sooner or later.
Now young people ___________to use computer to develop their ___________skills.
The future of developing countries__________ the hands of children, which is __________education and training for young people is important.
____________ poverty, wars _____________ thousands of lives in Africa so far.