Gates' purpose in telling the story about watching Nelson Mandela walk out of prison was to illustrate that there's hope for humanity.
Nelson Mandela was an activist. He fought for apartheid and discrimination against blacks in South Africa. He fought for the freedom of black people.  This eventually led to his imprisonment. 
Later he was eventually set free from prison. This represented hope to the people. It illustrated that we are all equal. This illustrated that there's hope for humanity.
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Subjective mood is used to express wishes, desires, and doubts and unknown or factual situations.
For this question you would tick off the first and last box. 
Hope that helps. -UF aka Nadia
        
             
        
        
        
When he wrote This excerpt he was referring to knowledge, he said that he reads a book a day and that knowledge was his banknote that got him so far,
        
             
        
        
        
A is the correct answer because a prepositional phrase is telling where something is located. so a is saying that the envelope is in the drawer.
        
                    
             
        
        
        
Answer:
I would like both of them to be as friendly