Do you know _____ they _____ at yesterday's meeting?

Do you know _____ they _____ at yesterday's meeting? do you know who _____ with at eight yesterday. What _____(造成) yesterday's accident ,do you know? Do you know who will speak at the next _____ (week) meeting? do you know the problem at the meeting yesterday Do you know the meeting _____ to next Monday? 1Do you know _____ this time yesterday? do you know what they _____（read） Do you know _____ tomorrow? Do you know _____(UFO)? 16.Do you know _____? What will you _____ at the meeting?