The public transport system in Beijing is very good now, so there _____be any difficulty in traveling around the city.
Was it midnight ________ the fire broke out?
— ________ he ________ anything about this historic site? — Yes. That’s why he suddenly becomes so obsessed with it.
You should never base anything on a theory that _________ impractical in practice.
With my hand-held Reader, I’ve read more books in the past six months than I ________ in the past six years.
Since then, more than 2 billion apps have been downloaded at prices ________ free to $900.