82. Edison is one of the greatest____　 in the world. (发明家)

81. Four____ of the students in our school are girls. (九)

80. We couldn't finish the work on time w___ their help.

79. He knows a lot of knowledge t____ he is a boy of ten.

78. The policeman prevented the boys from p____ football in the street.

77. This term I want to learn how to run quickly and to eat h___.

a)　　　　 根据句意和首字母或汉语提示写出单词。

76. The people's Republic of China was f____ on October, 1949.