When this new kind of virus broke out at first in Mexico, no one had the least idea that it would _______ so rapidly throughout the world.
A note was on the blackboard ______ “All those who have a fever must leave school right now”.
She felt sorry that she had disturbed the ______ calmness of a man she respected.
—He ought to have been warned of the danger. —______, but he wouldn’t listen to me.
All the task ______ ahead of time, they decided to go on holiday for a week.
—This wall of air is an effective answer to the problem and it ______ work. —But it is a question to put such a wall of air around the statue.