Thirty years ago this month,China's leaders launched an economic revolution.___________the door to free market reforms and foreign trade.
The little boy was found__________in his room the next day.
Your brothe__________be hungry now.-----he had lunch only two hours ago!
AIDS is said__________the biggest health to people in that area over the past few years.
With a lot of problems ________, the newly – elected headmaster is having a hard time.
Soon after getting off his horse, the man appeared at the second storey windows, ___________he could see nothing but trees.