Students ______ remain in their seats until all the exam papers have been collected.
The chances of discovering life on Neptune are about a million _____.
It was _____ by the railway board that the cost of rail fares would be increased by ten percent.
Our Party has always devoted great attention to raising the living _____ of the working people.
The map was drawn to the standard _____ of 1/100,000, so there was not much detail.
Radar enables the pilot of an airliner to take off, fly and land in _____.