60. Eric is so _________ (有礼貌的)! he holds the door open for others.

59. The rain has stopped _________ (完全地).

58. Simon lives on the _________ (第九) floor.

57. A little knowledge is a _________ (危险的) thing.

56. There is a long _________ (历史) behind that building.

55. Sue always _________(分享) things with her friends.

根据下列句子及所给汉语注释，写出空缺处各单词的正确形式。每空只写一词。

54. You’d better let in some fresh _________ (空气).