You didn't list a book, paragraph, passage, not even a sentence or source.. how are people supposed to answer this?
I would say the 1st one is the only one correct. The 2nd one should be who, the 3rd one should more and likely be whom, and the last one should probably be who. I don't know if I'm 100% though. I hope I helped.
Answer:
The more you read the better. If you don't understand some of the words look them up. Good readers usually have a huge range of vocabulary. Skim or scan the text first as well.
Explanation:
Answer:
by explaining how a captive’s condition was assessed.
Explanation:
The author developed the central idea that transporting enslaved captives was a trade just like any other in "Captain Canot" or "Twenty Years of an African Slaver" by explaining how a captive’s condition was assessed.
Most trades or all trades have profit as its main driving force, and profit cannot be made if the goods you sell is not good enough, so slave masters had to assess a captive's condition to find out if he was good enough to make a profit or not just like any other trade.