Nature is at its most beautiful in spring ______ all kinds of flowers are in blossom, ______ attracts people from all walks of life to take a spring outing.
Under more favourable conditions, we _____ better
Estuaries provide both recreation and education for human beings. They also _____ the economy through tourism and fishing.
For more than a hundred years black people had to fight ______ the rights to vote, choose where to live, study and work.
We have just heard the news that the experts are_____to go to Qinghai Province to investigate the possible damage caused by the serious earthquake
This special school accepts all disabled students, _______ educational level and background.