You can only be sure of _____ you have at present; you cannot be sure of something _____ you might get in the future.
How do people react __________ his speech against pollution?
In my opinion, learning is endless and the more knowledge you get, __________.
Thirty percent of the cattle __________ thin, but the rest __________ fat.
__________ of the land in that district __________ covered with trees and grass.
With great pain, the wounded soldier __________ to his feet and went on fighting.