<p>1) Although the precise date and place of the origin of baseball are [hotly debated], it is [beyond dispute] that the New York City boroughs of Manhattan and Brooklyn [play] an important role in [its] early development. </p>
<p>Answer: play </p>
<p>2) Willie Dixons [upbeat blues] compositions helped usher in the Chicago blues sound during the 1950s and [have become] standard numbers for the many young rock groups [trying to] achieve popularity [during] the 1960s.</p>
<p>Answer: have become</p>
<p>i picked no error for both questions, can anyone explain me why the answers mentioned above are correct...</p>