The best way to find the correct answer for a sentence completion would be : find that part of the text and look for the answer.
With this , you can find the answer in a more efficient way and in a shorter amount of time
hope this helps
        
             
        
        
        
1. Break down of Food into Energy  
  Oxygen
2. Absorb X - Rays in Bones  
  Calcium
3. Cell Membrane Function  
  Sodium
4. All Organic Compounds  
  Carbon
 
        
                    
             
        
        
        
Explanation: 
Between prokaryotes and eukaryotes, which type of cells are believed to have evolved first? Scientists have concluded that prokaryote life forms preceded the more complex eukaryotes. All organisms on Earth are classified into two basic cell types. Kary means nucleus.
 
        
                    
             
        
        
        
Answer:
Glue and sawdust.
Explanation:
Glue and sawdust are the substances that applied in wood to fill up cracks and grooves. You can use the glue and sawdust method to fill the gaps present in the wood. This method is a quick and easy solution that successfully fill up the gaps and grooves on the wood. The method of using this method is, first fill the gap with a small amount of wood glue, then rub sawdust into the gap which attached the saw dust with itself and the gaps are filled.