No significant new business is coming to town to fill the gap.
No one else has been able to fill the gap he left.
In some ways, industry is trying to fill the gap.
He seemed to be waiting for something to fill the gap.
You must now cut a new piece to fill the gap.
Well, you need something to fill the gap that was open.
The 737-400 was made to fill the gap in between the 737-300 and the 757-200.
The question, then, is how much public support will be required to fill the gap.
There was no one to fill the gap he had left.
These two books go a long way toward filling the gap.