—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
—Really? Who will give _________ lecture? — Mr. Wang, ________ professor from Nanjing University.
This problem is said_____ three times at the meeting. However, they haven’t arrived at a conclusion now.
At present there is a fierce debate over the question_______ human cloning should be allowed.
You have taken a hell of a risk and suffered a great deal, but you should believe it will ____sooner or later.
Li Ming was often late for school, ______made our head teacher feel very angry.