He was not an actor, who often appeared on stage, _____ a writer, writing stories.
Paper-making began in China and from here it ________ to North Africa and Europe.
He wrote this article ____this great communist fighter, Dr. Bethune.
As a result of the heavy fog, the highway has been closed up until further _______ .
It was pouring . All the machines stood _____ in the open air. A. uncover B. to be uncovered C. uncovered D uncovering
They were surprised that a child worked out the problem _____ they themselves couldn’t.