He was breathing ______ after the relay race. 

Most of the evidence was destroyed in the fire. _____, it would be almost impossible to prove Jim guilty.

I'm certain David's told you his business troubles. ______, it's no secret that he owes a lot of money to the bank.

Since Tom ______ downloaded a virus into his computer, hecan not open the file now.

“Facial transplants are no longer science fiction imagination ,”a surgeon has said,____that they are ___possible but  technically complex..