根据下列各句句意和空白之后的汉语提示词，在答题卡指定区域的横线上写出对应单词的正确、完整形式，每空只写一词。
56. Window screens are ___________(有效的) in keeping out mosquitoes.
57. An old man in _____________(寒酸的) clothes came to the door.
58. The other possibility, Mr. Jouanny said, was that the _________(小偷) might just like the painting.
59. Will it be ______________(方便的) for you to start work tomorrow?
60. All of them are______________(教授) of chemistry at Chicago University.
61. This is the most important___________(改革)of the police service in over 50 years.
62. Just now the police came and __________(逮捕) the man who had robbed the bank.
63. The bell____________(表示) the end of the period rang, interrupting our heated discussion.
64.We are going to ________________(删除) some names from the list.
65. The object of this society is to perfect its members ___________(实际地) and scientifically.