—Recent pressure at work may ______ his behavior.
The article raised doubts _____ the suspect was really guilty.
We regret _____ you that your application has not been approved.
--I didn’t get time to ask you why you looked so upset at the party. -- Oh, a lot of unexpected things _____.
Massive amounts of information _____ available because of the current policy to promote the free flow of speech.
The professor put forward three issues, none of _____ we had ever done any research into before.