The American civil War was a war fought from 1861 to 1865. It was one of the bloodiest wars.
The answer to the first question is A
the second question is B
the third question is B
the fourth question is C (I'm not sure)
This is a bit subjective, because there are a few ways this sentence could be re-written, however "<span>Tom opened the box and looked into it, only to find it empty" is the most standard. </span>
C the raw materials used to manufacture the product becomes cheaper
