题目

An i__________ has been under way for several days into the disappearance of a 13-year-old boy. (根据首字母单词拼写) 答案：【答案】investigation【解析】考查名词。句意：一项关于一个13岁男孩失踪的调查已经进行了好几天。在不定冠词an后面应该是单数可数名词；根据句意和所给首字母，应是名词investigation。故填investigation。10. The factory p_ 1,000 cars a week.