The present financial crisis has put the world economy in a difficult .
It is still under discussion ________the old bus station should be replaced with a modern hotel or not.(2011·重庆)
He is only too ready to help others,seldom,________refusing them when they turn to him.
The headmaster told the boy ________the angry teacher, but he refused to.
They are organizing a program to ________people's attention to protecting wild animals.
Completely ________in my writing, I didn't feel a heavy rain coming outside.