In the first paragraph, you could make it your thesis statement
College and career readiness means that a high school graduate has the necessary English and mathematics knowledge and skills—including, but not limited to, reading, writing, communications, teamwork, critical thinking and problem solving—either to qualify for and succeed in entry-level, credit-bearing two- or four- ...
Answer:
this...
is the vague pronoun in the sentence...
Well generally websites that end in .com are less trustworthy than .gov or .edu because they're government domain sites.