_____the size of the universe, some researchers believe that there is life beyond our planet.
—Why are the tax collectors so busy? —Many people prefer to have their tax forms completed by a professional rather than ___.
He ____ writing the paper now. He hadn’t written a single word when I left him ten minutes ago.
—Watch! —I ____ but ____ I ____ anything unusual.
—“Dear Frank, when will our wedding be?” —“Ah, when? God knows.” He said, and ____ away from her, walked rapidly away.
You’d better not wear such ties, because they ____ three years ago.