teacher, he has never given hisstudents so difficult a problem ____ they can’t work out

With our knowledge _________ practice, we can make contributions to our society.

Mr. Li is in trouble now.— You needn’t feel sorry for him. He_____it on himself.

China replaced Japan in 2010 as No. 2economy, _____ China’s continuing rise in economic and political influences.

Our hearts sank at the news that a pipeline(输油管) ______in Qindao and 62 people couldn’t survive the disaster.