The disappearance of dinosaurs is not necessarily caused by astronomical incidents. But _________explanations are hard to find.
alternative
aggressive
ambiguous
apparent
One third of the country ________ covered with trees and the majority of the citizens________black people.
The teacher as well as the students who_____fond of football,_____ playing together.
The father along with his children ______ solving word puzzles.
She told me that she had mailed part of the products and that the rest ______ in a few days.
He is the only one of the students who __________a winner of scholarship for three years.