Now one of the most serious problems many people are worried about _____ on the lack of adequate housing space.
When and where to build the new factory _____ yet.
All but one ______ here just now.
Eric is the only one of the boys who _____ a driving license.
______ of the land in that district ______ covered with trees and grass.
The number of people invited ______ fifty, but a number of them _______ absent for different reasons.