Professor Li always allows his students to voice their opinions in class, ______ sometimes their opinions are not sound.
The professor could hardly find sufficient grounds _____his arguments in favor of the new theory.
Modern science and technology has __________ communication between people far apart.
—I’m sorry, but the manager isn’t here yet. Shall I have him call you when he comes back?—No, I’ll call him later. If I call again in half an hour, do you think he ____?
Classical novels often have ________ which add interest, tension, or deeper meaning to the text; mist is one in Great Expectations.
—I expected him to be nervous before his speech, but he was as cool as a cucumber.—He _______ it carefully.