<p>Q1:The decision that [has just been] [agreed with] by the committee members should serve as a basis [for their] work in the [years to come]. No error
--The answer is [agreed with]. Why should it be "agreed to"? I thought it was "agreed on"...</p>
<p>Q2: In January, 1919, individual state legislatures started [to vote on] [whether] they [will support] the proposed Eighteenth Amendment to the Constitution [as] an instrument of national prohibition. No error
-- The answer is [will support]. I couldn't determine whether correct answer was "would support" or "supported". THe explanation says it is "would support"...
*Why wouldn't "supported" work? It says 1919...</p>
<p>Q3: By 1873, Coney Island was well on its way [to becoming] the most frequented summer resort in America, attracting crowds [that number] 25 to 30 thousand visitors [on] weekends and [as many as] 10 thousand midweek. No error
-- THe answer is [that number]. I understand the verb tense issue now but why is "to becoming" correct? Shouldn't it be "to become"?</p>