Do you know the man speaking at the meeting?

Do you know the student____was praised at the meeting? do you know the problem at the meeting yesterday the man speaking at the meeting is a professor___ mathematic jack,do you know the man standing at the door? do you know the man ( )? Do you know where the meeting Do you know who will speak at the next _____ (week) meeting? Do you know the man ( )(call) David? Do you know the man ( ) just now Ben do __(you) know the man standing at the door Yes __ (I） 最后期限了 Do you know the tallest man Bill is talking to at the 请问：Do you know the man who stood at the corner?