单词拼写（共10小题，每小题1分，满分10分）
根据下列句子及所给单词的首字母或汉语注释，在句子右边的横线上写出一个单词的正确形式。
66. You must ask ________________（允许）if you want to leave early.
67. The coming measure will bring both economical and environmental benefits, the
____________(后者) especially welcome.
68. She _______________(像) her sister in appearance but not in character.
69. People's abilities___________（不同）, but their rights and opportunities should be the same.
70. Congo, a(n) _______________ （非洲）country, became independent in 1960.
71. The car he was driving was over 30 feet in ____________（长）and had a 2,500-horsepower
engine.
72. There were ___________（总共）20 people at the dinner, including Mary and her daughter.
73. The book which the professor ____________（提到）to was not in the school library
74. Walt Whitman’s ____________（出生地）was restored in 2001 and it is a fine example of
native Long Island craftsmanship.
75. All the _____________（女）workers in this factory got a present on March 8.
，则a+b的值（）。