Answer:
The correct answer should be: "[...] only human language utilizes complex system of speech".
Explanation:
Although animals such as dolphins and great apes communicate, which is a form of language, only humans are capable of producing speech through the use of words and a complex set of phrases and sentences. Animals do not speak, even though they communicate differently, only people are able to use language in this way, only humans use a complex system of language data inside out their minds while using oral or written speech.
 
        
             
        
        
        
Answer:
The tour guide, who has become a good friend, is great!
Explanation:
The commas help separate the two ideas in one sentence correctly. A good way to check that this is correct is to remove the words separated by the commas - "who has become a good friend" - and check if the sentence still makes sense. In this case it would be "The tour guide is great!" which makes sense as a sentence. Thus, this version of the sentence is correct.
 
        
                    
             
        
        
        
To give your characters struggles and/or motivation, you need to find something they want to strive toward. Your character is a person, just like anyone in real life. They have goals, they have things they hate. They have a backstory that could provide a reason for their struggles, such as they grew up in a fairly wealthy home, but now they got disowned and are dealing with how to make their own money. 
Motivation tends to come from a struggle. For example, the character that is struggling with how to make their own money also has a motivation: money. They are used to having money, that now that they don't, they're going to try to get that money back. Sometimes, the character will have a lull in their motivation, which gives a perfect chance for a climax in the story. Something big happens to give them their push. Maybe they lose the apartment they were staying in because they were too lazy to find a job. Or maybe their significant other tells them that because they're such a worthless, jobless loser, that they're breaking up. No matter what this big event is, it shakes the character out of whatever lull they've been having and shows them that they need to be able to overcome their struggle, therefore providing them with their motivation back tenfold. 
I hope this explains this well enough for you, but I can always try to answer in more detail if you'd like. 
        
             
        
        
        
Answer:
The first statement is the best option.
 
        
             
        
        
        
Answer:
Its B because in the passage it says but my hopes fluctuate and my spirits are often depressed.