Answer:
Answered below
Explanation:
aFile = open("books.txt", "r")
This code uses the function open() which takes two parameters. The first parameter is the file name while the second parameter is the mode in which you are accessing the file. 
The "r" mode opens the file in a reading state. That is, you can only read from the file. This code completes the reading process
aFile.read( ) 
The "w" mode opens the file so you can write to it and make changes.
The "a" mode opens the file so you can add contents to it.
 
        
             
        
        
        
Answer:      c) Click on a different sheet tab at the bottom.
Explanation:    
To change between worksheets inside an Excel Workbook : Click on a different sheet tab at the bottom
 
        
             
        
        
        
I believe this is Insert Controls
        
             
        
        
        
To Change the Drop Shadow Just Go to effects on the photo go to drop shadow than change the spread and Distinse and Opasity.