根据句意和所给汉语，完成句子。每空一词
【小题1】Tom made many__________（错误）in the final exam.
【小题2】It's__________（不礼貌的）to cut in line.
【小题3】This__________（风俗）has been carried down from the 18th century.
【小题4】__________（最后），I returned the bow.
【小题5】To my__________（惊讶），she gave me an expensive present.