Nobody knows how he was murdered, but _______ people behind the scenes can guess why. 

Their products enjoy 30 percent ________ of the market in this country because both the quality and their service are fine. 

In the______of proof , the police could not take action against the man .

I’ve listened to Professor Smith’s talk about medicine,but I still haven’t got a good understanding of its key _________.

Contrary to our ______, the Chinese Men’s Football Team lost to Iraq.