I _______ have been more than six years old when the accident happened.
—What did the miner say after he was rescued?—He would never forget his stay there _____ he and other 152 miners had a terrible experience.
Although the official didn’t mention any names, everyone knew who he _____.
Working at home, which one could hardly imagine, has been made _____ with the development of computer technology.
Earthquakes _____ be dangerous, if you are in the wrong place.
. The past year has been successful and, _____ ahead, we expect to do even better in the coming year.