(     )1.A. Trees will blow the earth away.
          B. Trees can prevent the wind blowing the earth away.
          C. The wind will blow the trees away.
(     )2.A. The man threw the dirty things here and there.
          B. The man got back the dirty things everywhere.
          C. The man should not throw the dirty things about.
(     )3.A. Da Jun joined the army last year.
          B. Da Jun has been in the army for two years.
          C. Da Jun has been in the army since one year ago.
(     )4.A. China is the largest country in the world.
          B. China has the longest history in the world.
          C. China has a larger population than any other country in the world.
(     )5.A. It's so difficult that no one can do it.
          B. It's so difficult, but someone can do it. 
          C. It's so difficult that all of us can't do it.