At times the balance in nature is ______,resulting in a number of possibly unforeseen effects.
of the land in that district covered with trees and grass.
He is the only one of the students who a winner of scholarship for three years.
The number of people invited ____________ fifty, but a number of them __________ absent for different reasons.
Neither Tom nor Jack and I ____ his students.
The League secretary and monitor________asked to make a speech at the meeting last week.