Not until all the fish died in the river how specious the pollution was.
Your essay is fairly good and yet it leaves something ______.
Susan was expecting her favourite singers, but to her disappointment, _______ appeared.
China’s economic development has made ______ rapid progress in the past 10 years, and young people have made ______ great contribution to this progress.
—May I open the window to let in some fresh air ? —_____.
The project _____ by the end of 2011, will expand the city’s telephone network to cover 2000000 users.