根据短文内容，选择合适的单词填到空格中，并使用该词的恰当形式。每个单词只能用一次。

arrive    agriculture    custom   feast    independent    sad

 It is obvious that festivals are times of happiness, fun and excitement, not of       .
There are festivals to celebrate almost every kind of happy event. Some are for            
reasons, such as the beginning of the planting season or at harvest time. Others are in memory of one-time events, such as the     of a country or the      of a famous person, like Columbus Day in the USA. No matter what the reason, however, festivals are always times for great       with lots to eat, special and often new clothing to wear and generally lots of fun.