Complete the following passage by choosing the correct word from the given options.

Our sun and (i) ________ planets, including earth, (ii) ________ into existence at the same time and from a common source. Evidence (iii) __________ that the solar system (iv) _________ formed about 4.5-5 billion 
years ago. It is thought to have (v) _________ from a huge, spinning cloud of cosmic dust and gas (vi) __________ solar nebula. 

(i) (a) their              (b) its                          (c) it's              (d) these
(ii) (a) come            (b) coming                 (c) came           (d) will come
(iii) (a) suggests      (b) suggested             (c) suggest       (d) suggesting

(iv) (a) became        (b) was                      (c) is                 (d) will
(v)  (a) risen             (b) arisen                  (c) arising         (d) arose
(vi) (a) termed         (b) term                    (c) terming        (d) terms