题目内容：

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

A neighborhood watch is an 1. (organize) group of people who have volunteered to help prevent crime in their neighbourhood. They do this by 2. (keep) an eye on their neighbors’ households, patrolling the streets and contacting the police when they see wrong 3. (activity). Neighbourhood watches have 4. of history, but they 5. (introduce) to modem American cities after the public was shocked 6.( hear) how a woman was murdered in New York city while a number of witnesses stood by and did nothing. 7. (recent), however, some people have strongly objected to the organization after n neighborhood watchman shot to death a black teenager, 8. was on his way home in the evening. The shooting has led to a new suggestion 9. neighborhood watchmen shouldn’t carry guns while on patrol. Many neighborhood watch committees disagree 10. this  idea, saying that it will discourage volunteers from patrolling more dangerous districts. Besides, since Florida state law allows the carrying of guns, such advice is useless.