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(     )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.

A.It’s so  
B.So is it  
C.So it is  
D.It so is