"No, no ", he whispered,____ talking to himself.
With more forests being destroyed, huge quantities of good earth _____ each year.
—Would you like to join us in playing the game?—I’m sorry, but my homework ______ by now.
Great as Newton was, many of his ideas _____today and are being modified by the work of scientists of our time.
She tried hard to keep calm in face of the students, but the sweat on her forehead _____ her ____.
Thomas Alva Edison didn’t “invent” the light bulb (灯泡), but rather he ______ a 50 –year –old idea, which is not well –known.