Professor Black has written some short stories, but he is ____ known for his plays.
Was it not until you began to work ___ how much time you had wasted?
The city ________ against the terrible possibility of such things happening again.
.I’m sorry, but I didn’t mean to be rude to you. Can you______ me?
—Have you heard the story of “The Merchant of Venice”? —No. When and where does the story ______ ?
—What’s the matter with the man hanging his head there?—Well, if you _______ know, he was caught stealing my bike.