China is a country          the third world.

  A.belonging to           B.belongs to                  C.belong to                   D.be belonged to

China is one of the developing countries that           the third world.

A. belong to        B. belongs to     C. is belonged to   D. are belonged to

 As we all know, China is a developing country _______ to the third world.

              A. belongs             B. belong                     C. belonging                        D. belonged

 China ______ the third world is playing an important part in many issues.

   A. belongs to    B. to belong to    C. belonged to      D. belonging to