Answer:
affix is an element that is added to a word to form a new word therefore your answer for without means absence
 
        
             
        
        
        
Answer:
The answer is below
Explanation:
Research problems are more likely to be derived from circumstances that convey a sense of difficulty because it is during this period or situation there exist needs to solve such difficulty. 
The human drive to solve problems increases when there is a sense of difficulty, especially the circumstances affecting people generally.
For example, in an emerging field or novel situation involving difficulty like this period of coronavirus, there is an increase in carrying out more research problems to solve the difficulty.
 
        
             
        
        
        
Answer:
the correct answer is us: object of preposition
Explanation:
I took the test -- got a 100%
 
        
             
        
        
        
D is the correct answer because you are using a connective :)