The new CEO asked that all inter-office communications ______ in writing rather than in person, ______ possible.

I told your friend how to get to the hotel， but I perhaps I __________ have driven her there.  

（2014年北京市西城区高三5月二模试题）28. It was unusual that such close neighbors ______ not know one another. 

There was plenty of time. She ______ .

It was required by the headmaster that all the students        at the meeting.