So absorbed in his work ____________that not a sound ___________.
He was about to tell me the secret __________ someone patted him on the shoulder.
In the near future, more advances in the robot technology __________ by scientists.
—When __________ again? —When she __________, I'll let you know.
The plane __________ at 3:00.
Let's keep to the point or we __________ any decisions.