One afternoon my father and I go fishing on a　 　　　　　　　　 76．　　　　　　　　

　 riverside．We found the water was very dirty that　 　 　　　77．　　　　　　　　

　 we could not see the bottom．We also found some　 　　　78．　　　　　　　　

　 rubbish or dead fish flowing on the water．That　 　　　　　　　 79．　　　　　　　　

　 afternoon，my father and I caught only a smaller fish．　　　 80．　　　　　　　　

　 Why do the fish in the river die? That was because　　 　　　 81．　　　 　　　　　

　 of a lot of factories along the river always　　 　　　　　　　　　　　 82．　　　　　　　　

　 poured its waste water and rubbish into the river　　 　　　　 83．　　　　　　

　 and the water got polluting．Thus，most of the　 　　　　　　 84．　　　　　　

　 fish in the river killed． 　　　　　　　　　　　　　　　　　　　　　　　　　　　 85．　　　　　　

75. The signing of such a treaty made a major c__ to the world peace.

74. Amy was in charge of the office in the a_____ of the manager.

73. He failed again,which _________(使泄气) him.

72. Though ______(没有) experience, he managed to do his job well.

71. ______(消费者)are encouraged to complain about faulty goods.

70. The boy ________(接近) the birds quietly and watched them.

69. Can you ___________(推荐) me a good film?

68. There were only two old pieces of _______(家具)in the room.

67. The scientists often use_____(望远镜) to observe stars in the sky..