The workers who were late this morning _______ by the boss when I passed by the boss’ office.
—I’m sorry to have kept you waiting.—____, Bill.
Ten years ago, the population of our village was ______ that of theirs.
She has been working hard day and night, which of course, _______ her pale face.
--- Are you satisfied with what he did?--- No. It couldn’t have been ______.
--- He worked out such different questions at a very young age.--- Oh, he ______ a very smart student then.