66. We have to get the job done secretly (秘密地). We don't want others to know about it.
67. My train was 20 minutes late in the morning and there was a similar (相似的)delay in the evening.
68.Miss Li speaks English with excellent pronunciation (语音).
69. This pany is one of the Post Office's biggest customers (顾客.客户).
70. The drowning swimmer required the lifeguard's immediate (即刻的)attention.
71. Our victory was celebrated (庆祝) with music and dancing.
72. I've never seen a Shakespeare's play performed (表演) so wonderfully.
73. Nowadays most people use paper handkerchiefs/handkerchieves (手帕) .
74. The boy spoke in a very low voice , admitting/confessing (承认) he had broken the glass.
75.Themajority (大多数)of people in my neighborhood are Italian.
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解析：66. 副词修饰动词
67. 形容词作定语
68. 介词后用名词形式
69. one of 后用名词复数
70. 形容词作定语
71. 一般过去时被动语态
72. 考察see sth done,
73.此名词有两种复数形式
74. 考察非谓语语法，v+ing 作状语，
75. 固定短语，大多数