Try to understand the italicized words in the following sentence

Try to understand the italicized words in the following sentences from the context. Write the word(s) in the space given after each sentence. 2. Suddenly there was a power failure. After half an hour, people began to drift outdoors. Before long, everyone was sharing soda, lemonade and iced tea. Food began to appear and someone fetched picnic tables, and an impromptu block party developed.( impromptu )_______
【正确答案】:not planned
【题目解析】:P126