听下面一段短文，根据所听内容完成下面的填空（每空填一词）。

    …often on the weekends．These parties may be held to ____certain time like birthdays，end of the school year，____and the New Year…The person who invites guests usually servers simple ____and a small amount  of food．The children may spend the evening talking，listening to music and ____．In the US …to have parties without their parents being ____． Some parties …

胡萝卜素是一种常见的食物色素，可分别从胡萝卜或产生胡萝卜素的微生物菌体中提取获得，流程如下：