Definition: In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
Input: Article: New York City schoolchildren can't use cellphones at school because of Mayor Michael R. Bloomberg's ban on cellphones in schools. Many parents are opposed to Mayor Michael R. Bloomberg's ban on cellphones in schools by e-mail messages. There was a 13-year-old student who was shot with a gun after school, unable to call his mother for help. There was a high school student robbed three times last year, twice in her school building. There was a girl who got a piece of glass placed in her eye during school and was saved from a possible cornea transplant   only because, having disobeyed the cellphone ban, she was able to call her mother and get an operation on time. The ban has been on for years, but it set off a widespread parental outcry only in April, after some headmasters sent home letters reminding parents that cellphones are not allowed to be brought into school. Mr Bloomberg has defended the ban, saying that cellphones are bad and often used to cheat or call in friends for fights. If something is important, he says, parents can call schools directly. On the other hand, many of the e-mail messages from parents described the ban as "cruel and heartless", "absurdly  wrong-headed", "anti-parent", "ridiculous". "We respect the fears that parents have," David Cantor, a spokesman for Schools Minister Joel I. Klein said, "but after all the fact is that having phones in schools always leads to more problems." 
 Answer: he was too frightened to call
