1.   The scientists believe that there might be some planets to ……………… human life.

            A. provide                 B. accommodate       C. replace                  D. support

      2.   Mercury ……………… after the Roman God Mercury.

            A. named                   B. called                     C. is named                D. is called

      3.   The prerequisite condition for a ……………… planet is water supplies, appropriate temperatures and breathable air.

            A. habitable               B. inhabitable           C. habitant                 D. inhabitant

      4.   ……………… I have a look at the photos of outer space in your computer?

            A. Might                     B. Could                     C. Shall                      D. May