China _______________a high-speed railway network covering almost all its cities with a population of of more than 500,000 by 2015.
As long as we work closely together, we can overcome any difficulty, _________.
I don't care how much you earn. _________ is, I think, whether weare happy that really matters.
I was cooking in the kitchen when Dora returned, her face _________with mud and sweat.
The factory produced many famous cars, none of _________ shippedto foreign countries.
He held out his hand, but the lady refused to take it, which made him feel very _________.