79. ____________

79.It was my sister who first had the idea to cycle along the entirely Mekong River.

78.English began to be speak in both countries,　　　　　　　 78. ______________

77.The journey will begin at a altitude of 5000 metres. 　　　　77. ______________

76.Today , many people speak English than ever before. 　　　76. ______________

75. ____________

75.Late in the next century , people made voyages to conquer other parts of the world.

74. ______________

74.It was the first time in a year and a half that I have seen the night.

73.In some important way they are different from one another. 　73. _____________