Answer:
1). Literature <u>can be classified</u> into four main kinds.
2). The institute supported his efforts in the search for a <u>problem</u>.
Explanation:
The first sentence has been converted into the passive voice by substituting the subject 'we' with the object 'Literature' in order to shift the emphasis from the former to the latter and the verb. The antonym of 'solution' i.e. 'problem' has been employed in the second sentence as per the requirement. It means straightly the opposite of the 'problem.' 
 
        
             
        
        
        
He is terrified but more concerned to as why the raven is talking, he didnt screem or run when he heard the raven talk. I would run if a animal ever talked to me. Hope this helps!
        
             
        
        
        
A broken relationship can be fixed if the right channels of communication are provided. In case the author wants to show his or her friends that there is a possiblility to mend things, the bridge between them would be the best object to simbolize the means to work out the broken relationship. Figuratively, the bridge can create the path which will take each part to the other side to overcome past difficulties. The right option is C.