57．Mum，I have a sore t_________(喉咙)．

56．Everyone should eat a b_________(均衡的)diet．

55．We all like to sing p_________ songs．

54．I was really busy．I spent the w_________ morning in the office．

53．My daughter has a piano l_________ 　this afternoon．

52．September is the n_________ month of the year．

根据句意完成已给出首字母或汉语提示的单词。

51．Every summer I have a long v_________ and I can get a good rest．