Ok think about his, what do tv programs and radio programs get interrupted by every few minuets  
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I do not agree with the statement "the school ‘s current policy should be changed to allow students to carry them".
Students should use cell phones for :
i. additional learning outside their school curriculum,
ii. developing skills via watching tutorials on online etc,
iii. developing research skills by finding relevant information. 
However, hardly few students use cell phones appropriately.The major chunk of students use mobiles in wrong ways, like, watching bad content, playing online games, passing time on social media. All such things decrease the productivity of the students & fill their mind with lot of un-necessary content.
Hence, I strongly feel, cell-phones should be banned in school. Also, their usage should be restricted at homes too. 
 
        
             
        
        
        
Answer:
Water
Explanation:
With no one managing the cities vast and complicated tap water and sewer networks there would be flooding
 
        
                    
             
        
        
        
<u>Answer:</u>
You didn't include the answer choices, but a question with the same wording popped up on the quiz I just took and the answer for me was B : They suspect something strange may be going on.