question for grammer

wgy1

1.Working by chemical reaction, and being independence of atomospheric, rockers are used to power interplanetary space vehicles.

A.by     B. independence     C. to power       D.space.

the correct answer is B. why?

2.Independence Hall in Boston, USA, is where the declaration of In dependence also the United States Constitution were signed

A .In   B where.  C. also.  D were signed.

the correct answer is C.

but why D is correct? the subject-Declaration is single word.

numberX

麻烦你标明题号和选择的空格，谢谢！

consonant

从新整理一下吧？