the 3 sentence line is your answer.
"We listened to Professor Knight discuss the history of American relations with Cuba." We is capitolized as it is the beginning of the sentence. Professor Knight, is the name of the teacher and Cuba should be capitolized as it is the name of a country. :)
Answer:
Redoy: But you should know that physical exercise is very important to keep the body healthy and fit. ... Salim: It means if I do not take physical exercise regularly, I won't be able to keep my body healthy and fit. Redoy: Exactly! Without taking physical exercise regularly, you cannot keep yourself healthy and fit.
Explanation:
