SAT practice book from the College Board, pg 579/ needs to be explained to me...

Hi, this page is a CR so I can’t type all the paragraphs here so I am looking for someone who has the book so that he/she can explain the questions which I got wrong.

Q13. Self-worth and economic exertions were though to be _______

Q15, 17, 20, 23. also.

it will be nice of you if you can explain why the answers are correct because I tired to solve them twice and I got wrong in all of these questions.

thanks in advance.